How does the cooling fan work on a Jeep Grand Cherokee?

The cooling fan in a Jeep Grand Cherokee keeps engine temperatures at the correct level by kicking on during times when the engine reaches higher-than-average temperatures. Without it, the engine can reach dangerous temperatures and damage engine components.

How do you remove coolant from a Jeep Grand Cherokee?

To properly remove and replace coolant from any vehicle, follow these steps. Do not drain the coolant from your Jeep Grand Cherokee until the engine and coolant have cooled down. This is not something you should attempt to perform after taking a trip to the parts store to get more coolant to replace or any other errands.

When to replace the radiator on a Jeep Grand Cherokee?

Replace the antifreeze into the radiator when you’re done using the same antifreeze from the drain bucket or a 50-percent mixed antifreeze recommended for your year Jeep Grand Cherokee. You will need to start the engine and allow it to warm up with the radiator cap off.

Where is the radiator drain plug on a Jeep Cherokee?

This should be done only before the Grand Cherokee has been started for the day. Open the hood to allow light down into the engine compartment. Put on your safety glasses and crawl under the Jeep on a creeper to locate the radiator drain plug.

How does a jeep radiator and cooling system work?

5) Fan – This system can be either mechanical, electrical or a combination of both. The fan, depending on design, will push or pull cooler air through the radiator to aid heat-transfer from the coolant. 6) Fan Clutch – The fan clutch is used on mechanical fans only. It is designed to keep the optimum amount of air flowing through the radiator.

Why does my car fan keep running after I Turn Off the engine?

Running cooling fans help cool down the engine even after you turn off the car. Common Causes. If your cooling fan runs for over 10 minutes after turning off the engine, you may have a problem that needs to be fixed. Here are some possibilities causing the fan to stay running longer. low coolant level, faulty coolant temperature sensor,

Why does my Jeep Grand Cherokee radiator not turn on?

When the negative wire is attached to the relay, the relay should have an audible click as it activates. If the relay fails to click, move the jumper wires to the second set of terminals in the event the wrong terminals were being used. If the relay fails to click it is bad. Check the radiator fan switch if the relay proves to be good.

What are the symptoms of a bad cooling fan relay?

1. Engine running hot One of the first symptoms commonly associated with a bad or failing cooling fan relay is an engine that runs hot or overheats. If you notice that your engine is running at higher temperatures than normal, that may be a sign that the relay is not functioning properly.

Why does my air conditioner keep running when the thermostat is off?

Usually when the relay switch is broken, the fan will continue to run by itself. This happens because there’s no communication between the thermostat and the blower fan. Now, if it’s a short circuit, both the ‘ on ’ and ‘ off ’ commands you enter typically won’t get sent to the blower fan. As a result, the blower fan will continue to run.

Why does my AC fan not come on?

When the ac is of the radiator hoses both become same heat after a while and the overflow reservoir starts boiling over and the fan do not kick in. Any advise please. You might have an initial temperature sensor which causes the fan to come on when the temperature begins to rise; that sensor might be defective.

Why is my Jeep Grand Cherokee not shifting?

Matthew Wright has been a freelance writer and editor for over 10 years and an automotive repair professional for three decades specializing in European vintage vehicles. There is a common issue with shifting on a number of Jeep Grand Cherokee models as they age and their mileage increases.

Why does my Jetta not have a cooling fan?

Simply the engine is not hot enough to turn on the cooling fan, its not hot enough outside, you are driving getting plenty of air flow through the grille to keep things cool without the assistance of the fan. Its possible that you have no problem at all. Was this answer helpful? I got a 2002 Jetta the cooling fans don’t turn on .

What to do if your Jeep Grand Cherokee cooling fan is not working?

If the fan does not operate, continue troubleshooting. Switch the wires to the opposite terminals. If the fan still does not operate, the cooling fan motor and assembly must be replaced. If the fan does operate, the vehicle must be taken into a professional service center for testing on the PCM, which controls the cooling fan relays.

Why is my Jeep Cherokee heater not working?

What are common reasons my Jeep Cherokee has heater problems? While there are a variety of reasons your Jeep Cherokee heater is not working, the most common 3 are a broken heater blower motor, a problem with the thermostat, or a failed heater blower motor resistor.

What’s the problem with my Jeep Grand Cherokee air conditioner?

Air Conditioner. Cold Air On Left Side, Hot/ Very Warm On Left. I Am Having A Problem With Fan. Fan Use To Start About 10 Seconds After I Stared The Car. Now It Is About One Minute. Then The Fan Shuts … read more Second opinion] Blower motor wont shut off….. ignition off, key removed, and controller head removed and unplugged.

What kind of blower does a Jeep Grand Cherokee use?

AC is cold but the air flow can not be directed. It just blows out the floor vents and a little out the dash. … read more The blower motor in my 04 grand Cherokee runs intermitantly with the ignition off. I finally had to pull the 40 amp under the hood why? … read more

Why is my Jeep Grand Cherokee AC not working?

The 1999-2004 Jeep Grand Cherokee has a common failure where the blower fan wire adapter overheats and melts. Use this guide to fix and repair this connector and get your AC and Heater working again! No parts specified.

Why is my Jeep radiator not turning on?

The fan will turn on after the temperature reaches about half. Usually comes on when the car is standing still due to the small amount of air circulating through the radiator. Too many mods to list… No the AC will turn the radiator fan on to pull air across the condensor.

What to do if your radiator fan is not working?

No the AC will turn the radiator fan on to pull air across the condensor. Your going to need to check for power at the fan, the fan can still be failed and spin just fine by hand, considering you dont have high or low I would lean towards a fan or fan connector concern.

Why is the radiator fan not working on my Jeep Grand Cherokee?

If your Grand Cherokee has a bad engine temp sensor the radiator fan won’t know to come on, because the ECU won’t know how hot the engine is. You’ll need to locate and test the engine temp sensor. Depending on the model year and engine, the location varies. If it does end up being this sensor, they are very affordable.

Why are my coolant fans not running when AC is turned on?

Coolant fans not running when ac is turned on. AC compressor clutch engage then it will disengage. System has freon in it. It was working find but now nothin7. My car has 234565 miles. My car has an automatic transmission.

Can a radiator fan be turned on with a / C on?

Your electric fan WILL turn on with your A/C switched on, I was 100% certain it did BEFORE I went out to test it simply so I could say I tested it. So for clarification, I just tested it on my own rig, and the electric fan turns on with the A/C on.

How can I tell if my Chevy Aveo radiator fan is bad?

You can test the voltage going from the fan relay to the fan itself. If it is getting 12+ volts, the fan should be coming on. But if it’s not, which means the fan has gone bad. This video from Ratchets and Wrenches is a phenomenal resource on how to properly diagnose a wiring problem.

Where is the power distribution center on a Jeep Grand Cherokee?

The Power Distribution Center is located near the battery (left or right depending on the version). How to check the fuses? How to replace a blown fuse? Why do car fuses blow?

How big is the fuel pump relay on a Jeep Grand Cherokee?

Fuel Pump Relay, Automatic Shut Down Relay, Powertrain Control Module, Transmission Control Relay (4.7L)

Where are the fuses located on a Jeep Grand Cherokee?

Combination Flasher, Automatic Zone Control Module (AZC), Manual Temperature Control (MTC), Temperature Valve Actuator (MTC), Transmission Solenoid/TRS Assembly (4.7L), Park/Neutral Position Switch (4.0L, 3.1L TD), Driver/Passenger Heated Seat Switch The Power Distribution Center is located near the battery (left or right depending on the version).

Why does my 2007 Jeep Grand Cherokee not start?

2007 JEEP GRAND CHEROKEE. TRANSMISSION OVER TEMP SHOWS IN THE DISPLAY. VECHILE WILL NOT START FOR A FEW HOURS. DEALERSHIP DOESNT KNOW WHAT TO DO. TOLD ME IT HAS “AMNESIA”.

Why did my 2007 Jeep Grand Cherokee get towed?

Its the cars anti theft system which is triggered by a worn out key or a glitch in the system, had to have my 2007 jeep grand Cherokee towed this morning, an all they had to do was reprogram my anti theft system. Also made a new key with the remote (only way it will work since it has a required chip in it to start the jeep) just for precaution.

Why is my Jeep Grand Cherokee fan not working?

If the fan comes on you know the fault is before, if the fan doesnt come on you know its after, in that circuit or the fan itself. 2005 Jeep Grand Cherokee – Under the knife getting a complete overhaul. So It ended up being the fan motor.

2007 JEEP GRAND CHEROKEE. TRANSMISSION OVER TEMP SHOWS IN THE DISPLAY. VECHILE WILL NOT START FOR A FEW HOURS. DEALERSHIP DOESNT KNOW WHAT TO DO. TOLD ME IT HAS “AMNESIA”.

Why is the ignition key stuck in my Grand Cherokee?

Brilliant post, Milo, very useful. I have a 2003 Grand Cherokee Overland 2.7 CRD, which I love, and earlier today the ignition key would not come out of the ignition. My first thought was the ignition lock itself, so I spent some time jiggling the key in the lock without success.

What to do if your Jeep remote is not working?

1. Remove the battery. 2) Use 1/3 of a sticky note, fold it, and place it within the round battery slot (on the floor beneath where the battery is placed. 3) Put the battery in on the folded note. WALAAA! Thank you so much, this worked for me!!! It simply is a problem with the battery positioning within the fab. 1. Remove the battery.

Why is the radiator fan not working on my Jeep Liberty?

There are many reasons why your Jeep Liberty’s radiator fan is not working. Of all the ones listed above, start with the coolant level, then check the fuse. After that, the order isn’t so important. But, you don’t want to miss the easy fixes before you start testing wiring.

What to do if your cooling fan won’t turn on?

Pull the cooling fan relay out of the box. Replace the cooling fan relay with a new one. A stuck closed relay is the only thing that can operate the cooling fan continuously with the key off. The computer looses power with the key off and the same applies to the coolant temperature sensor.

How does a radiator fan work when the AC is on?

The electric radiator cooling fan assembly is controlled by a thermoswitch located in the side of the radiator. At higher coolant temperatures, the switch closes to start the cooling fans. Any time the coolant temperature rises to higher than normal levels, the fan will start and continue to run until coolant temperature returns to a normal range.

How do you replace a cooling fan on a Jeep Grand Cherokee?

Pull the cover from the fuse box on the end of the panel. Using the fuse diagram on the inside of the cover, locate the fuse for the cooling fan and remove it with needle-nose pliers. If the metal link inside the fuse is broken, replace the fuse.

What should I do if my radiator fan is not working?

A blown fuse is no big deal, and changing one does not cost a lot of money. If your car’s radiator fan is non-functional, check your car’s user manual and locate the fuse for the radiator fan controller or the fan. The fan itself often uses a big fuse of around 50A, while there might also be a separate small fuse to the fan control module.

Is there a way to test a radiator fan?

You can test the electrical radiator fans by taking a wire from the car battery, unplug the radiator fan connector, and put 12v+ and ground into the connector. This is the fastest and easiest way to test your radiator fans. Because the radiator fan is often drawing so much power, there is often a relay that is powering the coolant fan.

What to do if your Jeep Grand Cherokee radiator is not working?

The first thing that you would want to do is locate the fuse for your Grand Cherokee’s radiator fan and make sure that it hasn’t blown. If it is blown, replacing the fuse will only solve the problem for a very limited period of time. Unless the wiring issue is fixed, the fuse will blow again. The wiring harness itself can go bad.

How to check battery voltage in Jeep Cherokee?

Check for battery voltage at terminal 2 of the fan relay connector (Fig. 43). If battery voltage is not present replace the fan diode assembly. With engine running, A/C on, and fan relay removed, check for battery voltage at terminal 2 of fan relay connector (Fig. 43).

Where is the relay on a Jeep Grand Cherokee?

A Jeep has more than one relay that are the same (go by the relay number on the top or side of the relay) in the fuse box on the driver’s side fenderwell. Remove a known good relay and swap it with the radiator fan relay. Operate the vehicle and check the operation of the unit replaced.

Remove a known good relay and swap it with the radiator fan relay. Operate the vehicle and check the operation of the unit replaced. If the unit works with the fan relay it proves that the relay is not the problem. Test the relay using jumper wires and a voltmeter.

How does the cooling system work on a Jeep Cherokee?

When coolant temperature is below 190*F (88*C) the switch is open preventing the relay from being grounded and the cooling fan from being energized. When the air-conditioning is used the engine ECU grounds the A/C relay coil allowing current to flow through it.

How to troubleshoot an electric cooling fan problem?

1.Has the Cooling Fan Actually Failed? 1 If the fan comes on when the AC is running at MAX, but doesn’t run when the engine is hot, check the temperature sensor… 2 If the fan fails to come on, first check for a fan blown fuse or triggered breaker. On older vehicle models, you may… More …

Why is the fan not working on my Jeep Grand Cherokee?

The fan wiring is some of the more vulnerable wiring in your Grand Cherokee. You can test the voltage going from the fan relay to the fan itself. If it is getting 12+ volts, the fan should be coming on. But if it’s not, which means the fan has gone bad.

How to troubleshoot a jeep PWM fan relay test?

Radiator Fan Motor Circuit Wiring Diagram (1999-2003 4.0L Jeep Grand Cherokee). TIP 1: The way I’ve designed the Jeep PWM fan relay test, you’ll need a scan tool that can read live data (not a code reader), since you’ll need to keep an eye on the engine’s coolant temperature with it.

What is the PWM code for a Jeep Grand Cherokee?

This tutorial will help you to diagnose the Pulse Width Modulated (PWM) fan relay on the 1999-2003 Jeep 4.0L Grand Cherokee SUVs and/or the codes P1491 ( Radiator Fan Control Relay Circuit ). The dealer, at the time of this writing, will charge you $95 (US) to diagnose it.

Where are the fuses in a Jeep Cherokee?

Here you will find fuse box diagrams of Jeep Cherokee 1997, 1998, 1999, 2000 and 2001, get information about the location of the fuse panels inside the car, and learn about the assignment of each fuse (fuse layout) and relay. Cigar lighter (power outlet) fuses in the Jeep Cherokee are the fuses #1 and #2 in the Instrument panel fuse box.

What are the switches on a Jeep Cherokee?

Instrument Cluster, Radio, Rear Wiper/Washer Switch, A/C Heater Control or Heater Control, Rear Window Defogger Switch, Extended Idle Switch, Front Fog Lamp Switch, Rear Fog Lamp Switch, Transmission Range Indicator Illumination (PRNDL), Transfer Case Switch Illumination

What happens if your coolant level is low?

If your coolant level is low, there is a chance that you will get air in the system, and the coolant temperature sensor will not read the coolant temperature correctly. If the coolant level is low, you need to refill the coolant to optimum levels. Failing to do so could risk your engine becoming overheated and seized.

What does it mean when your radiator fan is not working?

This is what we call a blown fuse. A blown fuse is no big deal, and changing one does not cost a lot of money. If your car’s radiator fan is non-functional, check your car’s user manual and locate the fuse for the radiator fan controller or the fan.

Why is my Jeep Grand Cherokee not cold?

Most of the time, when your Grand Cherokee’s air isn’t blowing cold enough, it is going to be a lack of refrigerant causing the problem. We recommend having a professional recharge your A/C if it does end up being a coolant issue.

What makes a Jeep Grand Cherokee air conditioner work?

The only thing that the air conditioning system has in common with the heater is that they both use the climate controls and the blower motor. It is entirely possible for your Grand Cherokee’s heater to work just fine even when the air conditioner is not blowing cold at all.

When does the radiator fan turn on in a jeep?

The radiator fan only turns on once the temperature reaches a certain temperature I believe its about half. But on highway speeds it should run very cool. Your electric fan WILL turn on with your A/C switched on, I was 100% certain it did BEFORE I went out to test it simply so I could say I tested it.

What to do if cooling fan does not work?

If fan motor does NOT operate, check continuity between terminal 4 of the relay connector (Fig. 43) and body ground connections on the fender panel back from the relay connector (Fig. 42). If continuity exists replace the fan motor.

What happens to the engine when the fan clutch fails?

As the fan clutch is one of the main cooling system components, it is very important to the proper operation of the engine. When it fails, the engine can be put at risk of serious damage due to overheating.

What is an electric fan clutch?

The fan clutch is a cooling system component that controls the operation of the engine cooling fans. While many newer vehicles now use electric cooling fans to keep the engine cool, many older vehicles used a mechanical fan clutch to control the fans.

How can I tell if my car has a fan clutch?

If your car has a fan clutch, common signs include the vehicle overheating, the cooling fans working very loudly, or engine performance decreasing. 1. Vehicle overheating

How does the coolant sensor work on a jeep wranger?

Coolant temperature sensor test and change for the Jeep Wranger. Coolant Temperature Sensor monitors the temperature of the water in the engine. The PCM uses this temperature reading to adjust the fuel injection and timing. In some cases the PCM uses the reading from the sensor to turn on the electric cooling fan if so equipped.

Where is the temp sensor on a jeep?

The one wire sensor in the back sends temp readings to the gauge in the Jeeps dash. If you temp gauge isn’t acting right, replace the one wire. The two wire sensor located in the thermostat housing sends its signal to the PCM. For poor performance issues and testing we are going to look at the two wire up front.

Where is the CTS sensor located on a jeep?

Where is the CTS sensor located? On Jeeps there are two coolant sensors. There is one at the front of the engine in the thermostat housing, this one has two wires. Then there is another at the back drivers topside of the engine cylinder head just to the right of the valve cover, this one has one wire.

How to change the temp of the coolant sensor?

Also a way to vary the temperature of the sensor. Something like a pan of water on the stove top over low heat. Use a thermometer to measure the water temp as it climbs. Not the water temp as you measure the resistance and compare it to the chart below. See YouTube video at the bottom of the page.

What happens when your Jeep Grand Cherokee heater stops working?

At this point, the blower motor blows air across the it and the newly heated air blows on to the driver and passengers. If the heater has stopped working in your Grand Cherokee, this process has failed in one way or another.

What does the thermostat on a Jeep Grand Cherokee do?

Never touch the radiator cap unless the vehicle is ICE COLD. The job of your Grand Cherokee’s thermostat is to regulate the temperature of the engine. It does this by allowing water to enter the engine when it is getting hot, and by keeping coolant from entering while the vehicle warms up.

What to do if your Jeep has no heat?

Cause:*The heater core is leaking. Fix:*Replace the heater core. Alternative/temporary repair: Locate the 2 heater hoses going to the firewall underhood. Cut the hoses and splice them together. Hose splices are available at any auto parts store. Vehicle will have no heat, but A/C will still operate.

Why is my Jeep Grand Cherokee heater not working?

While there are a variety of reasons your Jeep Grand Cherokee heater is not working, the most common 3 are a broken heater blower motor, a problem with the thermostat, or a failed heater blower motor resistor.

Where is the blower Motot relay on a 1998 Jeep Gran Cherokee?

Where is the blower motot… Where is the blower motot relay on a 1998 Jeep Gran Cherokee Submitted:12 years ago. Category: Jeep Show More Show Less Ask Your Own Jeep Question Share this conversation Answered in 6 minutes by: 11/26/2008 Jeep Mechanic: Jerry, Master Mechanic replied 12 years ago Jerry, Master Mechanic Category: Jeep

Where is the blower motor on a jeep?

Fix:*Remove the blower motor and inspect/clean the fan blade (squirrel cage type). Normally the blower motor is located under the passenger side dash. Most are easy to remove, held in with 3 screws, either Phillps or T20 torx.

Where does the radiator fan go when its hot?

Having said that Matt, as I already suggested, when its hot out I run right at the middle hash mark, when its cool I run just mm or 2 below, with a known fully functional fan. It has done this for the 1.5 years I have had it, first noticed while I was towing and it freaked me out for a second but it has NEVER gone above the 1/2 hash mark.

What makes the radiator fan turn on or off?

A radiator temperature-sensing switch activates the fan relay at 198 degrees F turns the fan on and controls its operation. Make sure the key is off. Switching relays is the fastest way to check for a bad relay when possible.

Can a bad clutch fan cause a Jeep Cherokee to overheat?

There is also a tiny orange fan diode (below/beside air box) but this rarely gives any problem. Check the clutch fan. It’s easy to overlook but a bad clutch fan will cause overheating in stop & go traffic, while you’re idling or out on the trail at low speeds.

Why is the radiator on my Jeep Cherokee overheating?

If someone changed the lower hose and didn’t swap over the spring the hose can actually close shut. The faster the engine runs the harder the hose will clamp shut without this spring as the pump tries harder to pull water from the radiator. Have you tried a simple flush & refill?

How do you know if a car fan is faulty?

If the fan comes on you know the fault is before, if the fan doesnt come on you know its after, in that circuit or the fan itself. So It ended up being the fan motor. When the car was running I would hit the motor with a mallet and I would get it to kick on for a bit and then it would give out until I hit it again.

Why does my Jeep Grand Cherokee Fan quit working?

In this one we take a stab at permanently fixing a common issue with the 1999-2004 Jeep Grand Cherokee. The electric cooling fan will quit working, and your jeep will overheat, due to a failure in the electronic fan control relay. This is a heat related failure and I add a large heat sink and relocate the relay to try and avoid further issues.

What is the problem with my Jeep Grand Cherokee?

2011 JEEP GRAND CHEROKEE. IT APPEARS I HAVE BLEND DOOR ACTUATOR PROBLEM. I AM ALSO HAVING A PROBLEM WITH FAN. FAN USE TO START ABOUT 10 SECONDS AFTER I STARED THE CAR. NOW IT IS ABOUT ONE MINUTE.

Why does the radiator fan not come on when the AC is on?

In order for the AC Condensor to do its job it must stay as cool as it can. As for the engine coolant temp sensor, if the coolant is not hot enough to make the fan come on, then there is no need for the fan yet and there is no problem.

Where can I buy a jeep radiator fan assembly?

Shop AutoZone for Jeep Grand Cherokee Radiator Fan Assembly. 10% OFF $75. Use Code: DIYSAVE10 Online Ship-to-Home Orders Only

What kind of fan does a jeep diesel engine use?

The Jeep diesel radiator fan is completely different than anything you’ve seen on other engines. Instead of using an electric fan or a mechanical fan with a viscous clutch, Jeep uses a hydraulic radiator fan. The hydraulic radiator fan receives power steering fluid pressure from the power steering pump.

What to do if your hydraulic radiator fan is not working?

Always start your diagnosis by checking the readings from the ECT, TOT and AC pressure transducer. If the readings are within range, use a scan tool to check the pulse width commanded by the fan control module. Make sure you’re using the proper power steering fluid.

Is there a hydraulic radiator fan for a Grand Cherokee?

Hi all I have a 2001 Grand Cherokee Limited with the 4.7L engine 2wd if that matters. This one has the Hydraulic fan which blows me away. I spent a good deal of time trying to figure out where the relay was ands there is not one. Anyway my unit is running hot after idle for say 5-10 minutes. As soon as I start moving it cools down.

Shop AutoZone for Jeep Grand Cherokee Radiator Fan Assembly. 10% OFF $75. Use Code: DIYSAVE10 Online Ship-to-Home Orders Only

How does the hydraulic fan work on a jeep?

The fan control solenoid regulates flow to the hydraulic motor by pulsing the power steering fluid based on commands from the fan control module (FCM). See inputs below. The Jeep shop manual warns that: “The hydraulic fan and drive is not serviceable.

When to turn on the hydraulic radiator fan?

The hydraulic cooling fan runs at 500 rpm as soon as the engine is on, as soon as the engine temperature rises above a certain level, the PCM will command the hydraulic fan solenoid valve more open, to ramp up the fan speed.

What should I do if my Jeep Grand Cherokee is overheating?

In the Cherokee XJ you should fill the radiator with coolant and let the engine work and reach normal working temperature for at least 5-10 minutes. then, install the radiator cap in place, turn off the engine and fill the coolant bottle to the max. In the Grand Cherokee WJ there is a screw that should be open, we will publish an article soon.

What causes the radiator on a jeep to overheat?

Check the radiator cap – a radiator cap that won’t hold pressure might cause overheating problems. If you replaced any of the cooling system components (besides the fan/fan clutch) you should bleed the air out of the system.

Why does my 2003 Jeep Grand Cherokee overheat?

i have a 2003 ,overheated. solution: change the fan motor. faulty fan motors due to faulty windings from factory. LISTEN TO THIS IMPORTANT MESSAGE!!!!!!!!!!!!!!!!!! For anyone having overheating problems with their Jeep Grand Cherokees take these necessary steps before taking your vehicle to a dealership………. 1.

Why is there no air in my Jeep Grand Cherokee?

Found broken vacuum hose under battery platform going into reservoir, replaced that (my cruise control started working). Cleared check valve in vacuum line near firewall, got a bit of air blowing but still not enough. Finally after reading your idea here, pulled the blower motor to check direction of flow.

What kind of blower motor does a 2004 Grand Cherokee have?

2004 grand Cherokee limited v8 4.7 here. blower motor (sensor) replaced last month (Not OEM part) due to A whisper of hot and cold air only. The cold and hot air is coming out now but not nearly enough like before to cool entire interior. Have to keep fan on high just to feel slightly comfortable in driver seat.

Why does my Jeep Grand Cherokee not have an air conditioner?

Blower Motor – If there is no air blowing from your Grand Cherokee at all, the blower motor is at fault. They are not that expensive and are easy to replace (most of the time). Blend Door – The blend door controls how much air conditioned and heated air enters the cabin.

Where are the fuse panels on a Jeep Grand Cherokee?

Here you will find fuse box diagrams of Jeep Grand Cherokee 2005, 2006, 2007, 2008, 2009 and 2010, get information about the location of the fuse panels inside the car, and learn about the assignment of each fuse (fuse layout) and relay.

Why is the air conditioning not working on my Jeep Grand Cherokee?

What are common reasons my Jeep Grand Cherokee has air conditioning problems? While there are a variety of reasons your Jeep Grand Cherokee air conditioning won’t work, the most common 3 are a refrigerant leak, an electrical climate control issue, or a problem with the air conditioning compressor.

How to repair a Jeep Grand Cherokee heater resistor?

How to repair Jeep Grand Cherokee Heater Blower Resistor. I own a 2005 Jeep Grand Cherokee. I haven’t had any major problems with my Jeep until the heat started fading. First the low speeds went out and then medium…until I was left with high. This might not seem too annoying, but trust me.

How does the radiator work on a jeep?

They consist of two reservoirs connected by a series of pipes, in which the coolant runs. The fan increases the air flow going through the radiator at low speeds or when parked. It is activated only when the engine cooling circuit temperature reaches standard values.

When do you turn on the radiator fan?

The fan increases the air flow going through the radiator at low speeds or when parked. It is activated only when the engine cooling circuit temperature reaches standard values. With an accurate definition of fluid dynamics, our original fans guarantee a strong noise reduction and a noticeable increase in efficiency.

Where is the temperature sensor on a Jeep Grand Cherokee?

To test the solenoid unplug the temperature sensor located between the A/C compressor and the alternator just in front of the intake manifold. If the solenoid is working properly the fan will go into Hi-speed. If there is no change in RPM of fan the solenoid or the wiring from ECM to solenoid is at fault.

What kind of cooling system does a Jeep Comanche use?

1987-1992 Jeep Comanche (MJ) w/ LHD; w/ 4.0L engine.Application: Cherokee Cooling System. Coolant Bottle for Jeep Cherokee XJ w/ 4 cyl engine.

What kind of engine does a Jeep Cherokee have?

Jeep Cherokee XJ (1998-2001) with 4.0L engine Jeep Cherokee XJ (2001) with 4.0L engine Jeep Cherokee XJ (1995-2001) with 2.5L engine diesel. 1993-1996 Jeep Grand Cherokee w/ 4.0L engine

What kind of fan does a Jeep Grand Cherokee have?

APPLIES TO: This tutorial applies to the following vehicles: 1999, 2000, 2001, 2002, 2003 4.0L Jeep Grand Cherokee. Radiator Fan Motor Circuit Wiring Diagram (1999-2003 4.0L Jeep Grand Cherokee).

1987-1992 Jeep Comanche (MJ) w/ LHD; w/ 4.0L engine.Application: Cherokee Cooling System. Coolant Bottle for Jeep Cherokee XJ w/ 4 cyl engine.

Why is the air blower on my Jeep not working?

I will start the Jeep and the air blows fine, then without rhyme or reason it completely stops (there is no specific duration between work/failure). Depending on the length of the trip, it may come back on again. I replaced the blower motor resistor and I thought that fixed the problem, but unfortunately it did not.

Why are the vents on my Jeep not working?

This is typical of a vacuum leak or failure of the vacuum check valve. When you ascend the hill, you loose vacuum from the engine and the A/C vacuum controls loose suction so the vents can’t remain open. Most systems then default to defrost vents.

What should you do if your Jeep overheats?

If your Jeep overheats, you should diagnose and find the reason as soon as possible, replacing/rebuilding the engine is an expensive fix and it woulds be better to avoid it. How to avoid overheating? The first thing would be to keep the cooling system in proper shape. 1.

Is there coolant coming out of my Jeep?

I bought a 2000 Jeep Cherokee Sport with 45k mile (yes, that’s right) three days ago. Had them change the timing belt at the dealer before I took it. Have driven it 200 miles. Pulled in the driveway just now and fluid (I think it is coolant) pouring out from under the front.

What to do if your Jeep Grand Cherokee overheats?

I have a 2002 jeep grand Cherokee Laredo 4.0. overheating, replaced thermostat and gasket, temp gauge sensor. jumped out fan, fan would run but fab will not operate with A/C defrost. replace control module for fan, operated 3 times then quit. we have no blown fuses. please help.

Why is my Jeep Grand Cherokee not cooling?

With that being said, one very common problem is the radiator’s cooling fan not working. Jeep Grand Cherokees that have a factory tow package will have a mechanical fan attached to the water-pump in addition to the electric fan located closer to the radiator underneath the plastic shroud.

Why is my radiator on my Jeep not working?

Caution DO NOT open the radiator cap on any hot cooling system. With that being said, one very common problem is the radiator’s cooling fan not working.

Where is the water pump on a Jeep Grand Cherokee?

Jeep Grand Cherokees that have a factory tow package will have a mechanical fan attached to the water-pump in addition to the electric fan located closer to the radiator underneath the plastic shroud. Jeeps that have both fans, may not show signs of overheating unless being operated in extreme conditions.

What to do if your Jeep Grand Cherokee AC unit overheats?

What causes a Jeep Wrangler to overheat at idle?

When your Jeep overheats only at idle, in most cases it is the Radiator Fan Clutch that has gone bad. Overheating during idle means the fan is not pulling sufficient air through the radiator to maintain the engine operating temperature. Components that can cause your jeep Wrangler to overheat.

What should the thermostat be on a Jeep Wrangler?

The job of the thermostat is to monitor the engine temperature and engage the fan once it exceeds operating temperature. The Jeep Wrangler 4.0 has a cooling system that requires a 195 degree thermostat. Anything lower than that can trigger the CHECK ENGINE light. It should activate automatically as the engine temperature fluctuates.

Why does my Jeep Cherokee have too much coolant?

When the thermostat is stuck open, the vehicle will be getting too much coolant. On the other hand, if it is stuck in the closed position, the radiator will not be getting any coolant at all. If you do end up replacing the thermostat, make sure the new part is an exact match to your make and model of Cherokee.

What causes dual zone AC on Jeep Grand Cherokee?

Jeep Grand Cherokees with dual climate control (for the AC / Heater system) that have incorrect air temperature blowing on either the passenger or driver’s side is usually one of two things. One of the blend door actuators (motors), or the the dual zone blend door assembly could have a broken door.

How to remove skim key from Jeep Grand Cherokee?

JEEP SKIM KEY PROBLEM… SOLVED!!!! ECM REPROGRAMMED Jeep Grand Cherokee. Remove SKIM from ECM If playback doesn’t begin shortly, try restarting your device. Videos you watch may be added to the TV’s watch history and influence TV recommendations. To avoid this, cancel and sign in to YouTube on your computer.

When to reset the Immobilizer on a Jeep Grand Cherokee?

The system is activated when something other than an authorized key is used to try to start the engine. Most models are also equipped with an alarm system as part of the security system. If something triggers the immobilizer or the alarm system, you need to reset and rearm the system.

How do you test a Jeep Grand Cherokee?

Test the relay using jumper wires and a voltmeter. Connect one jumper wire from the battery positive terminal to the relay positive terminal. Connect the second jumper wire from the negative terminal of the battery to the negative terminal of the relay.

Why is a radiator important in a Jeep Grand Cherokee?

A Jeep Grand Cherokee radiator is an extremely important part of your vehicle’s cooling system. No one likes to be stranded due to an overheating engine, and the damage from too much heat is often severe.

Do you need antifreeze in a Jeep Grand Cherokee?

Your Jeep Grand Cherokee expresses your individual style while still being the practical people-hauler your family depends on to take them to any destination. Keep your vehicle performing its duties by maintaining its cooling system with antifreeze from AutoZone.

Why is my radiator fan not turning on?

The fan will turn on after the temperature reaches about half. Usually comes on when the car is standing still due to the small amount of air circulating through the radiator. No the AC will turn the radiator fan on to pull air across the condensor.

Is the blower motor on a 2011 Jeep Laredo?

Blower motor intermittently stops on a 2011 Jeep Grand Cherokee Laredo. New blower motor and resister. Also chkd all 3 gear motors under dash – all good.

Why is my Jeep Grand Cherokee not working properly?

My 2011 Jeep Cherokee has been in 6 times now for the AC and heat. It’s always the passenger side. Warm air for the AC and cool air for the heat. It’s in right now they are say it’s no longer covered under warranty. Since its been an on going problem since I bought the Jeep I think it should be covered. I don’t know what to do.

What’s the problem with my 2011 Jeep Laredo?

My wife just recently began experiencing an issue with her 2011 Jeep Grand Cherokee Laredo. She will have the blower motor running and it will just quit, then cycle back on again maybe a moment or two later. Sometimes the motor will quit running for up to a minute.

Blower motor intermittently stops on a 2011 Jeep Grand Cherokee Laredo. New blower motor and resister. Also chkd all 3 gear motors under dash – all good.

Why does my 2015 Jeep Grand Cherokee not work?

2015 Jeep Grand Cherokee Limited- Center control knobs / Heated Steering Wheel and Heated Seats NOT WORKING! The Touch Screen works fine, but the center control knobs underneath the touch screen are not working. This is also causing the heated seats/heated steering wheel functions not to work.

How does a cold reset work on a Jeep Grand Cherokee?

I think its a cold reset of the integrated control system, by pulling the fuse one disconnects it from power, same effect would be done with disconnecting it from the battery and have a cold reset right there. The whole ICS / electronics section of the Jeep seems not very software robust in my opinion. 43 people found this helpful.

What to do if your Jeep has no climate control?

Then remove the hvac unit and control knobs. Careful with the knobs, they are keyed and will only remove when turned to a certain position. You can carefully pull while turning them and they should pop out when you find the slot. Using a flat screwdriver unclip the clamshell plastic housing and then remove the control board.

Why is my Jeep Grand Cherokee not working?

For one month, the driver’s side heater and air conditioner was not working. Air would blow out but there wouldn’t be any heat or cold air, which was highly crucial during the bay area 30 degree mornings. Meanwhile, the passenger air vents functioned perfectly.

Are there any problems with the 2014 Jeep Grand Cherokee?

Ask your Jeep dealer. CarComplaints.com Notes: The 2014 (and 2015) Jeep Grand Cherokee have a serious defect trend of transmission complaints. Most of the complaints are for rough shifting — things like jerking & hesitation when shifting gears.

How to replace Waterpump, thermostat and coolant temp sensor?

In this walkthru I show how to replace a waterpump, thermostat and a coolant temp sensor in a jeep grand cherokee. This 3.7L engine is found in many Chrysler Dodge Jeep vehicles such as the Nitro, Liberty, 300 and others. Goodies include a belt routing diagram and how to bleed the air from the coolant. Loading…

Why does my Jeep Grand Cherokee Run Hot?

Anytime you’re putting your hand around the radiator or fans in the engine assume that they are hot and that the fans can kick on at any time, even without your key in the ignition. While not having enough coolant may make your engine run hotter, it can also cause your Grand Cherokee to not be able to create enough heat.

Why is the heater not working on my Ford Escape?

If the neither hose has any heat, you may have air in the cooling system, low fluid, or low pressure. If you look at your temperature gauge, and the engine is running hotter than normal, but there is not heat coming from the heater you may be having issues with the water pump.

Why is my 2001 Jeep Grand Cherokee overheating?

There was a leak in the radiator of our 2001 Jeep Cherokee Sport, so my son replaced it. He also replaced the upper and lower rad hoses as “insurance.” The upper one was clogged with rust. Now he needs to know the location of the bleeder screw to finish up.

Why are my coolant fans not turning on?

If both fans operate then it is time to take a look at the pressure transducer. Don’t let this strange name fool you, it is simply a sensor that relays the amount of pressure in the system to the PCM and the PCM decides when to turn on the fans and or compressor clutch.

Why is my a / C fan not running when the AC is turned on?

Many people confuse pressure in the system for the system being full. Volume and pressure are two different properties of a gas, which the refrigerant in your A/C system is a gas when it is allowed to escape to the atmosphere. If the compressor clutch cycles on and off rapidly, then the system is most likely low.

What should I do about my Jeep Grand Cherokee radiator?

No one likes to be stranded due to an overheating engine, and the damage from too much heat is often severe. Regularly draining and flushing Grand Cherokee radiators prolongs their lives by removing rust and corrosion. Order online from AutoZone and enjoy Same-Day Store Pick-up if you need a replacement right away.

What kind of engine does a Jeep Grand Cherokee have?

The Jeep Grand Cherokee has also had its fair share of V8 engine options, up to and now including the Hellcat-sourced 6.2l supercharged V8 that puts out 707 horsepower in the Trackhawk.

When did the Jeep Grand Cherokee come out?

Since its introduction in 1993, the Grand Cherokee has had its fair share of options, special editions, and crucially, powerplants. The Jeep Grand Cherokee is one of the staple vehicles of the SUV revolution.

Why is the radiator fan on my Jeep not working?

So I left the car wash this morning an noticed my temperature gauge was rising higher than it normally does. I pulled into the nearest parking lot and lifted the hood. I noticed that the engine seemed really hot (temperature gauge got to about 3/4). Then I realized the radiator fan was not even going.

Why is my Jeep running hot while sitting still?

If your Jeep is running hot while sitting still your fan must be near non-functional. I will see if I can locate the operation explanation for the fan… Sounds like maybe a plugged rad or thermostat. These jeeps tend to run a bit hotter to begin with so I put a 180 degree t-stat in mine when I was chasing my cooling issues recently.

Can a Jeep Grand Cherokee have an air conditioner?

It is entirely possible for your Grand Cherokee’s heater to work just fine even when the air conditioner is not blowing cold at all. That’s why troubleshooting the air conditioner is totally different than troubleshooting the heater.

Limited adds automatic climate control, heated mirrors, 10-way power seats with mirror memory, and an Infinity 180-watt AM/FM/cassette stereo system with CD. Two engines are offered. Standard equipment is Jeep’s 4.0-liter inline-6, which was re-engineered for 1999. It’s quieter, cleaner and more powerful, producing 195 horsepower.

Jeep Cherokee XJ (1998-2001) with 4.0L engine Jeep Cherokee XJ (2001) with 4.0L engine Jeep Cherokee XJ (1995-2001) with 2.5L engine diesel. 1993-1996 Jeep Grand Cherokee w/ 4.0L engine

What kind of fluid does a Grand Cherokee use?

Most ZJ owners do most of the maintenance themselves, which means that the fluids have to be maintained within proper ranges to continue to have a good solid ride. XJ Grand Cherokees have parameters that are specific only to them, so make sure you verify and look up what fluid type you need.

Blend door actuator plays a role in controlling the air flow and temperature inside your Grand Cherokee. Anytime there is a problem with the temperature of the air conditioning system, it could be a problem with the blend door actuator.

Why is my Jeep PWM fan not working?

The electric radiator fan motor does not come on. Coolant bubbling out of the coolant reservoir. Temperature gauge on the instrument cluster is maxing out. If your Jeep overheats beyond a certain point, you risk blowing the head gasket and/or cracking the cylinder head.

Why does the a / C quit blowing on my 1999 Jeep Grand Cherokee?

The A/C (and heater) quit blowing on my Dad’s 1999 Jeep Grand Cherokee a while back so I took a look at it. The fresh air/recirculate blend air door seems to have broken up in the air duct causing it to suck up against the blower intake and stop all the air flow.

Why does my Jeep Grand Cherokee make a clicking sound?

The most common symptom of faulty blend door actuator on Jeep Grand Cherokee is a slight clicking sound repeatedly coming from under the dashboard. The sound will be most prominent for a few seconds when you turn on the air conditioning or adjust the temperature. Sometimes changing the temperature can temporarily stop the sound.

What does the coolant temperature sensor do on an engine?

The engine coolant temperature sensor’s job is to measure the coolant temperature for the engine control module. With this information, the engine control module adjusts the air-fuel mixture depending on the temperature. This article will discuss the most common symptoms of a bad coolant temperature sensor, location, replacement cost.

How to test your Cherokee coolant sensor and wiring?

To properly test the coolant sensor, you’ll need a multimeter that can test for resistance, most do. Attach one lead of your tester to the black wire, and the other lead to ground. Remove the coolant sensor from the reservoir tank. With the float all the way down, the resistance across the contacts should be zero.

How does the coolant temperature sensor work in a car?

Coolant Temperature Sensor monitors the temperature of the water in the engine. The PCM uses this temperature reading to adjust the fuel injection and timing. In some cases the PCM uses the reading from the sensor to turn on the electric cooling fan if so equipped.

What are the symptoms of a bad PWM fan relay?

Symptoms Of A BAD PWM Fan Relay. The most obvious symptom of a BAD PWM fan relay is that your Jeep is gonna’ overheat. You’ll also see one or all of the following symptoms as the engine overheats:

What are the symptoms of a bad fan relay?

Symptoms Of A Bad PWM Fan Relay. FAN RELAY TEST 1: Checking For Power. FAN RELAY TEST 2: Checking For Ground. FAN RELAY TEST 3: Checking For The Relay Control Signal. FAN RELAY TEST 4: Calculating the Amperage Draw of the Fan Motor.

How can I check if my Jeep Grand Cherokee has air?

You can check the blower motor by running a separate power line to it, it should run full blast when you do this. 28 people found this helpful. The fan does work but very little airflow even on high. I even used a garden hose to try and flush any crud out a second time and still NO SUCCESS.

What does a fuse do on a Jeep Grand Cherokee?

Fuse box diagram (fuse layout), location, and assignment of fuses and relays Jeep Grand Cherokee (WJ) (1999, 2000, 2001, 2002, 2003, 2004, 2005). A fuse is an element for protecting the electrical system. A fuse will trip (i.e. it will blow) in the event of a failure or improper interventions in the electrical system.

Why is my Jeep Cherokee overheating so much?

If your radiator overflow is full (and you radiator fan is kicking on), it is very likely that a bad thermostat or bad water pump are causing your Cherokee to overheat. Of these two, the thermostat fails more often than the water pump. It’s also much more affordable and easier to get to.

How does the coolant system in a jeep work?

It keeps the engine block at its optimum operating temperature. When the engine is cold, the thermostat closes to restrict coolant flow to the radiator and allow the engine to quickly reach its operating temperature. As the engine heats up, the thermostat opens and allows coolant to circulate through out the entire coolant system.

What causes a jeep radiator to overheat?

As the engine heats up, the thermostat opens and allows coolant to circulate through out the entire coolant system. The thermostat can fail by either sticking open, sticking closed, or completely breaking and cause an internal blockage. All these scenarios can cause overheating, no hot air output, or low running temps.

What should the pressure be on a jeep radiator?

General rates of increase are usually 8psi to 15psi. If pressures exceed the rated amount for the cap, the valve will open and release the pressure and possibly coolant as well.

Why is my air conditioning not working on my Jeep Grand Cherokee?

There are many reasons why air conditioning may not be working properly on your Jeep Grand Cherokee. When looking for the reason, you should always start with the most obvious cause, low refrigerant level in the system. In any case, it is advisable for laypersons to visit a workshop.

How does the cooling fan work on a Jeep Cherokee?

Jeep Cherokee Electric Cooling Fan Diagnosis & Repair. When the air-conditioning is used the engine ECU grounds the A/C relay coil allowing current to flow through it. This activates the A/C relay which then supplies current to the A/C clutch, fan diode assembly and cooling fan relay.

Is the hydraulic radiator fan 4.7L still working?

I have a 2002 GCL 4.7L with the hydraulic fan and it has continued to work great. I had at one point considered swapping it out for an electric fan, since I am more familiar with those, but the hydraulic unit has continued to perform admirably. The fan always seems to be turning at some speed, even when cool.

Where are the fuses on a 2003 Jeep Grand Cherokee?

2003 Jeep Grand Cherokee Fuse Diagrams for Junction Box in cabin and Power Distribution Center under hood 10. Radiator fan relay 40A Alldatadiy.com and Eautorepair.net are professional-grade shop manuals—period. They include wiring diagrams and technical service bulletins.

Where does the power from the cooling fan relay come from?

Power is supplied to the left fan through cooling fan relay #1 and is grounded through the Mode Control relay. The right fan is powered directly through cooling fan relay #2 causing both fans to operate at high speed. helpful? The fans are always running on low when they do come on.

Why is my radiator cooling fan not working?

The radiator cooling fans will not come and it causes overheating. It may be the fan relay or switch (whatever it is called). My problem is trying to locate it. Is it near the battery or where is it so I can install the one sold to me by Autozone automotive parts store.

When to replace the fan relay in a radiator?

3.4L V6 I replace the water pump, the thermostat (twice), the cooling senor (twice) replace all fan relays, but the fans will not come on till it reach 220-225. What else can I try? Is there another senor somewhere?

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