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.

Where is cooling fan relay located?

The cooling fan relay is normally located in either the underhood fuse and relay center or mounted to the electric fan assembly behind the radiator. To replace the cooling fan relay, there are two methods that we will cover for the positions mentioned above.

How much does it cost to repair a jeep fan relay?

Most auto repair shops charge between $75 and $150 per hour. When is the code detected? With the key on or engine running, system voltage over 10v, fan relay commanded on, the Powertrain Control Module ( PCM) detects a shorted or open condition in the relay control circuit.

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.

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 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 is the relay on a radiator fan?

The fan relay is often located in the engine bay’s fuse box, but the best way is to check your repair manual to find where it is located. Testing a 4 pin relay is often very straightforward. Remove the relay and give 12 volts to pin 30 and 85. Ground pin 86 and check if there is voltage coming out from pin 87.

Where is the clutch relay on a Jeep Cherokee?

A/C Clutch Relay On right front wheelwell. Under right side of dash, on evaporator housing. On load level compressor bracket. On center of right front wheelwell. On right front wheelwell.

What does a fuse on a Jeep Cherokee do?

Fuse box diagram (fuse layout), location, and assignment of fuses and relays Jeep Cherokee XJ (1984, 1985, 1986, 1987, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996). 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.

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).

What is the ignition switch on a Jeep Cherokee?

Ignition Switch – Back-up Lamps, A/C Relay Coil, Shift Selector, Speed Control, Aux. Cooling Fan Relay Coil WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.

Where is the starter relay on a Jeep Cherokee?

On front of right front wheelwell. Under right side of dash. Under instrument panel, to right of steering column. In tailgate, next to wiper motor. Starter Relay (Graphic 1) Behind right headlight, on wheelwell. Starter Relay (Graphic 2) Behind right headlight, on wheelwell. Above starter relay, behind battery.

Where are the fuses on a Jeep Cherokee?

Jeep Cherokee (XJ) 1997 – 2001 Fuse & Relay Information FUSE NUMBER FUSE CURRENT RATING CIRCUIT INFORMATION (What the fuse is fo 1 25 Amp Power outlet – Located top left column i 2 25 Amp Cigar lighter 3 10 Amp Left headlamp

What is the OBD2 code for a jeep cooling fan?

OBD2 Code P0480 Jeep definition: The electric cooling fan is controlled by the powertrain control module (PCM) through the cooling fan relay based on inputs from the following components: – The engine coolant temperature (ECT) sensor – The intake air temperature (IAT) sensor – The A/C selector switch – The A/C refrigerant…

What causes an error code on a fan relay?

There are multiple factors that can lead to this error code. Some of the most common possible causes are: Defective faulty fan control relay 1. Faulty cooling fan 1. Open or shorted fan control relay harness. Open or shorted fan cooling fan harness. Poor electrical connections in the cooling fan circuit. Defective coolant temperature sensor.

What is the diagnostic code for cooling fan 1?

P0480 is a diagnostic trouble code (DTC) for “Cooling Fan 1 Control Circuit Malfunction”.

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.

P0480 is a diagnostic trouble code (DTC) for “Cooling Fan 1 Control Circuit Malfunction”.

Why are my cooling fans not turning on?

If the compressor is running long enough to build heat in the high side of the system, and the cooling fans don’t turn on, I would begin finding the fan relays and add power to the appropriate circuit to see if the fans turn on at all. This will require a wiring diagram.

How to fix an OBD-II engine cooling fan?

1 Replacing the VSS sensor 2 Replacing the engine coolant temp sensor 3 Repairing or replacing of the fan wiring harness 4 Replacing cooling fan 1 5 Repairing electrical connection issues 6 Replacing AC pressure switch 7 Replacing the fan control relay

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.

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 does the Auxiliary fan assembly on a car do?

However, in order to feed it with an ample supply of air, especially during tough driving scenarios, your ride should also have an Auxiliary Fan Assembly. This fan assembly consists of a fan motor, fan blade, and shroud. It provides air to your ride’s radiator. This air assists in hastening the cooling of your engine.

How long does it take to replace an auxiliary fan?

In case you decide to install a new auxiliary fan, you can follow this helpful guide. This project can be done in an hour. Use the floor jack to lift your vehicle. If you are planning to pull the auxiliary fan from below, make sure to lift the car higher to give you ample room beneath the hood.

What kind of auxiliary fan does VDO use?

VDO offers a wide range of car cooling system components, which include cooling modules, cooling motors, and auxiliary fans. This brand also sells the individual components of the auxiliary fan assembly separately. Their auxiliary fans are available in single or dual units. The same goes for the cooling product selections of TYC Genera.

Why is my a / C blower not working in my Grand Cherokee?

However, over the next few weeks the A/C blower problem returned intermittently. It seems to be a problem when the temp is around 80 degrees or higher and the car has been sitting in the sun. The problem again happened on 6 October (a warm day) and it was exactly the same problem originally described.

When did I replace the blower motor on my Jeep?

I brought the Jeep back in on 3 August 2016 to have the parts replaced. Two parts were replaced at that time: 1. Module/resistor/power, blower motor (P/N 68079480AA Module – Power)

Why does the a / C blower motor cycle on and off?

The A/C blower motor cycling on and off is definitely the A/C system informing you of a problem. It’s identifying a fault. That fault is usually a broken blend door actuator gear on the driver or passenger side. If the blend door motor actuates past its normal travel… the A/C unit acts in this manner.

I brought the Jeep back in on 3 August 2016 to have the parts replaced. Two parts were replaced at that time: 1. Module/resistor/power, blower motor (P/N 68079480AA Module – Power)

When does Jeep go back into the shop?

Jeep is going back into the shop on 10 October 2016 for another try at fixing the problem. I had the same problem however, it only occurred after the PCM was replaced. A few folks have mentioned this or similar problems. I thought I’d add my $0.02 worth…

Why is my air conditioner compressor cycling on and off?

The air conditioner compressor was rapidly cycling on and off. I turned the A/C off and stopped putting R-134a into it becuase the compressor cycling was almost causing the car to die from the load it was putting on the engine. Onto Google I went.

Why does my AC keep starting and stopping?

As a result, your AC system will start and stop continuously. Check whether the screen of your thermostat is fading or even goes blank. If that’s the case, then it may be running low on power or intermittently losing power.

How can I tell if my radiator fan is working?

When a radiator fan works it usually makes a whirring sound that is easily noticeable. However, the radiator fan does not always start spinning on ignition. The ECU signals the radiator fan to work at the precise time. So, do not worry if the fan doesn’t immediately start working. Visually check the fan if you don’t hear its noise. 1. Broken Fuse

What should I do if my Jeep Cherokee cooling fan does not work?

Check for battery voltage at terminal 2 of fan relay connector (Fig. 43). Connect a jumper wire across the radiator temperature switch harness connector. If fan operates proceed to next step. If fan does not operate replace radiator temperature switch once the engine has cooled down.

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.

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.

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.

What kind of engine does a Jeep 4.0 have?

We carry expedient Jeep 4.0 inline 6 crate engine options, ATK replacement engines, high performance stroker engines and more in a variety of styles and finishes. Having trouble deciding on the right product? Our team of service professionals is standing by to deliver skilled support.

What kind of engine does a jeep performance crate use?

Edelbrock engine styles are available in black and polished finishes, water pump style or satin aluminum depending on your preference. Be sure to check block, head, crank, cam castings and other details for each product to ensure a perfect fit.

What are the most common problems with Jeep air conditioning?

Here are some of the most common problems Jeep owners experience with their AC systems. Before we discuss some of the problems that you might experience firsthand with you Jeep AC , it is important to take note of leaks and how they affect your AC. Leaks are the number one issue with AC across the board.

What does it mean when your air conditioner stops running?

If your air conditioner seems to stop running before your home has reached the set temperature, this signifies a problem. It’s called air conditioner short cycling, and it can be caused by several different things. Air conditioner short cycling occurs when something within the system prevents your unit from completing a full cooling cycle.

Why does my air conditioner fan keep failing?

For those of you who aren’t sure, here’s a crash course: The fan in your AC unit helps circulate the cool air throughout your home. And while that explanation makes sense, an air conditioner has so many parts, that it can be confusing to figure out which specific component is causing the AC to fail.

When to replace the fan motor in your air conditioner?

Sometimes, replacing the fan motor in your air conditioning system is inevitable, but with routine maintenance, you can prolong the lifespan of your air conditioner. When it comes to fan motor burnout, dirt is the biggest culprit.

Where is the fan located in an air conditioner?

And while that explanation makes sense, an air conditioner has so many parts, that it can be confusing to figure out which specific component is causing the AC to fail. The air conditioner fan is located in the condenser unit (the portion of the AC that is parked outside your home).

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 Wrangler have?

2000-2006 Jeep Wrangler TJ w/ 4.0L with Reverse Rotation. 1995-2001 Jeep Cherokee XJ w/ 2.5L or Diesel less Serpentine Belt. 1996-2001 Jeep Cherokee XJ w/ 2.5L Diesel engine. 1999-2001 Jeep Grand Cherokee WJ w/ 3.1L Diesel engine.

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 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.

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 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.

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 kind of fan shroud for Jeep Cherokee XJ?

Mishimoto MMFS-CHE-68 Silver Aluminum Performance Fan Shroud.mishimoto Rendimiento Ventilador Sud… Mishimoto MMFS-E46-99NPT Black Performance Fan Shroud Kit.mishimoto mmfs-e46–99NPT Negro Rendimie… Pages with related products.

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 the radiator fan not working on my Jeep Grand Cherokee?

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.

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.

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.

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.

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