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 …

How many relays does a GM electric fan need?

By using the two PCM outputs and only two relays, two electric fans can be controlled independently. GM vehicles equipped with an LS-series PCM and electric fans operate both fans in low-speed and high-speed mode only. This requires two PCM outputs and three relays.

How many relays does a Camaro electric fan need?

This requires two PCM outputs and three relays. By using the two PCM outputs and three relays, two electric fans can be controlled in low-speed and high-speed modes. The LS1 Camaro and Firebird are fitted with two electric fans and manual A/C controls. The PCM is responsible for controlling both A/C operation and electric fan operation.

When to test a low or high speed fan?

Cooling fan motor testing (low and high speeds), relays, harness connectors…it’s all here. Generally, the low speed fan kicks on when the A/C is turned on or when the coolant temperature hits around 200 degrees F. High speed kicks on around 220F.

When to turn on the cooling fan relay?

The cooling fan relay is an electromagnetic switch that controls the power supply to the engine’s cooling fans. It ensures that the energy-intensive devices only run when needed, usually when the vehicle is immobile. When the engine temperature approaches unsafe levels, the vehicle’s computer or temperature switch turns on the cooling fan relay.

Can a bad fan relay cause an engine to overheat?

However, a bad cooling fan relay isn’t the only culprit for excessively high engine temperatures. Many other issues can cause the engine to run hot or overheat. Rather than uncommonly high engine temps, the driver may notice that the cooling fans have stopped running.

What kind of Fuse do you need for a fan relay?

For a second relay, both gray wires can be connected to the temperature sender, and both orange wires can be connected to your 12 volt ignition source. Each relay will control a single fan, and a 30 amp fuse is recommended for each relay connection to the battery.

What should the resistance of a fan relay be?

A normal relay’s resistance will read between 40 to 80 ohms. Higher resistance levels warn that the coil has started to fail while lower readings mean the relay has broken down. Still another DIY test involves shaking the cooling fan relay and listening for any noises.

Why are my cooling fans running at all times?

3. Cooling fans stay on at all times. If the cooling fans are staying on at all times, this is another (less common) symptom of a possible problem with the cooling fan relay. If the relay shorts internally, it may cause power to be permanently switched on, which will cause the fans to run at all times.

Why does the engine cooling fan not turn off?

I was wondering if anyone knows why the engine cooling fan does not go off when you turn engine off. We had to pull the fuse that is under hood on top of battery. Once we pulled it, it went off, but when we put it back in the fan started up again. Any and all replies would be greatly appreciated. 50 people found this helpful.

What should water temp be to turn on cooling fans?

Even with the AC off, the cooling fans should cycle on and off when the coolant temperature reaches around 205-210 degrees F. And as you noted, there is a tie-in with the AC system that should at least bring the fans to low speed even if the water temp is low.

Why are the cooling fans not working on my car?

Many other issues can cause the engine to run hot or overheat. Rather than uncommonly high engine temps, the driver may notice that the cooling fans have stopped running. A faulty or broken relay cannot deliver power to the cooling fans. In turn, the unpowered fans won’t run, leaving the radiator to its own devices.

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.

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.

What causes a car cooling fan to run continuously?

2. A cooling fan temperature switch (or sensor, in some vehicles) can also get stuck, which may cause the fan to run continuously any time you turn the ignition key on or start the engine. Troubleshoot the switch. 3.

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.

When does cooling fan ( 902 ) appear on a HP notebook?

HP Notebook PCs – Error “Cooling Fan (902)”. Appears when the Notebook is Powered On. This document pertains to the specific notebook series listed in the following table. An error message appears stating “Cooling Fan (902)” when the notebook is powered on or resumes from Standby (S3) state.

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 the fan on my heat pump working?

Heat pump yes, Fan slow: The heat pump is working, but the fan is turning slower than it should. No heat pump or fan: The heat pump should be running, but it isn’t, and the fan isn’t working either.

What does it mean if your heat pump is not working?

Homeowners often report a heat pump fan not spinning. Heat pump yes, Fan no: The heat pump is running, but the fan isn’t. Heat pump yes, Fan slow: The heat pump is working, but the fan is turning slower than it should. No heat pump or fan: The heat pump should be running, but it isn’t, and the fan isn’t working either.

How can I tell if my coolant fan is running?

Providing that you have safe access to the underside of the vehicle, a volt meter, and experience doing electrical testing on vehicles, check for moisture and corrosion at the coolant pump connector. Check for approximately source voltage at pins 1 and 2. Check for continuity to ground at pin 4.

Is the engine cooling fan running all time?

Several days ago,one of my old customers drove his Chevrolet Cruze to my garage and ask to solve the trouble of engine cooling fan running all time.It took technicians to fix the problem,and I will share the progress here.Hope it will be a useful info!

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.

Why does my floor fan not turn on?

If you turn on your fan and the fan motor hums even though the fan blades won’t move, the cause may be that the gears are stuck. Once you’ve cleaned the fan as outlined in the previous step, try unscrewing the motor housing so you can see the electric motor parts.

Why is my radiator fan clutch not working?

The fan clutch is responsible for attaching the radiator fan to the engine and makes it work. If this clutch goes broke, the fan won’t work. It is the usual wear and tear over the years that may cause the springs in the clutch to corrode or even burn out. If you cannot find any other radiator fan problems, the clutch is most likely the cause.

Why does my AC fan keep failing to start?

If you leave the unit running, the fan motor will keep attempting and failing to start. The capacitor may also be used to keep the fan motor running properly as well as starting it.

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 happens if your radiator fan is not working?

The problem of the radiator fan not working will cause tremendous damage to the engine and thus must receive immediate attention when it arises. Learn how a radiator and a radiator fan work, how to diagnose the issue of radiator fan not working and the common causes.

Why do you need a cooling fan relay?

Average rating from 29 customers who received a Cooling Fan Relay Replacement. Most modern vehicles use electric cooling fans to help pull air through the radiator so that it can keep the engine cool. Most cooling fans use electric motors that have a moderate to high current draw, and as a result are commonly controlled using relays.

Do you have an electric cooling fan in your car?

If the cooling system in your vehicle uses an electric cooling fan, most likely you have a transversal (sideways) mounted engine. However, some longitudinal (front to rear) mounted engines use the electric fan as well, but they usually have an engine-powered cooling fan.

Why is my cooling fan not working on my laptop?

One of the most common causes of the “cooling system” message is a malfunctioning cooling fan. Your laptop fan could stop working if it becomes too clogged with dust, or suffers damage from an accidental drop. If you receive the message shortly after your laptop received a nasty spill, the fan may require replacement.

What causes engine cooling fan not to work?

What Can Stop Your Fan From Working: Defective temperature switch, (ECT) sensor or other sensor Engine thermostat is stuck OPEN (engine never gets hot enough to turn on the fan) Faulty fan relay A wiring problem (blown fuse, loose or corroded connector, shorts, opens, etc.) Bad fan motor Defective fan control module

What cause a cooling fan not to run?

7 Causes of Radiator Fan Is Not Coming On Broken Fuse A fuse supports almost everything electrical in a car. Faulty Coolant Temperature Sensor There are often two different systems in different car models. Broken Wiring or Bad connection If the fan is not working even when the car is overheating, there might be a wiring issue or a bad connection.

Why did my PC fans stop working?

If CPU fan has a lot of dusts, it will slow down the speed of the CPU, and it may also cause the CPU fan to stop working normally. You need to clean the CPU fan to keep it always clean in order to ensure the normal function of CPU fan.

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.

Why does my car fan come on when the engine is not running?

Consult your vehicle repair manual to check the required sensors and switches. On a warm engine, the fan may come on even if the engine is not running. When working on a hot engine or an engine that is running, keep your hands and tools away from the fan blades and moving components.

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 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.

What to do if your Honda fans are not working?

Honda Fans not working? DO this easy check First! If your Honda Fans aren’t working it can be easy repair. I found that both the radiator fan and the AC fan weren’t working. or replace the fans, relays, temperature switch or even the fuses. The temperature switch is an easy repair and it’s even easier to replace.

What does no power to fan solenoid mean?

Just had my cummins isx inframed with a new head and brought it home notice the fan would not disengage.unhooked air line to fan clutch it moved in and out checked for power to solenoid and no power with key on could not find any broken wires now stumped anyone with any ideas. Every month 400 people find a job with the help of TruckersReport.

How to fix overheating caused by blocked heat sink?

[Solution] How to Fix Computer Overheating Caused by Blocked Heat Sink 1 Unplug your computer before opening the case. 2 Consider other options first. 3 Remove the small CPU fan plug from the motherboard. 4 Remove the CPU cooling fan. 5 Release the CPU. 6 (more items) See More….

What to do if your Mercury outboard does not start?

If the engine does not start after disconnecting these wires, check the purple wire, which is the ignition switch wire, for damage and that it is secured properly. Try disconnecting the black/yellow wire from the engine to check the kill circuit first. If the engine still does not start, change the white/green and the green/white stator wire.

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

Laptop fans could use a little help from external cooling fan solutions like those sold on Amazon. These gadgets provide additional air circulation that alleviates some of the pressure put on built-in laptop fans. They’re inexpensive and detachable so you don’t have to carry them around when you don’t want to.

1. Engine running hot 2. Cooling fans do not function 3. Cooling fans stay on at all times Average rating from 129,472 customers who received a Vehicle Engine Cooling Inspection. Most modern vehicles use electric cooling fans to help pull air through the radiator so that it can keep the engine cool.

Why is the radiator fan not working on my Mercury Grand Marquis?

Your Mercury Grand Marquis ‘s radiator fan has one of the most important jobs on the vehicle. It is the last line of defense between you and an overheating engine. If the radiator fan is not working, it’s a serious problem. Just because the radiator fan is not on does not mean that it is not working.

Do you need to replace the motor on a ceiling fan?

Replacing a ceiling fan motor requires the correct ceiling fan parts. Before you begin, consider the type of fan you have. Some ceiling fans have motors that quickly and easily plug in and out. Other fans require you to match the colored wiring from the fan to your new motor.

What should I do if my Ceiling Fan is not working?

Here’s how you can see if your fan’s motor is causing the problem: Step 1: Use a screwdriver to remove the housing cover on the ceiling fan so you can see the electrical wiring inside. Step 2: Make sure there are no loose wires keeping your fan from operating.

Which is the best forum for Mercury outboard problems?

This is the best Mercury Outboard Forum on the internet, it’s yours! If you own a Mercury Outboard. Are you looking for good advice about your Mercury outboard engine problems and issues.

Why is my car fan not coming on?

If the sensor isn’t working, your fan won’t come on because it won’t know that the temperature is hot enough to require activation, which can frequently lead to overheating. The sensor is usually located in the car thermostat cover. To check it, disconnect the wires from the sensor and touch them together.

What should I do if my radiator fan doesn’t work?

Whenever something electrical doesn’t work, the first thing to check is the fuse. If you don’t know where the fuses are in your vehicle, consult your owner’s manual to see which fuse controls the cooling system. Make sure the fuse for the radiator fan is intact. If it is not, replace it immediately, and this should take care of the problem.

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.

What happens if the AC Fan in your RV is not working?

But if the AC fan in your RV does not work right you may lose your cool. The fan is one of the more important parts in your RV AC unit. Keeping it maintained will save you a lot of trouble and help you remain cool. RV AC Fan Not Working: There are a lot of reasons why your RV AC fan does not work.

Why does radiator fan not working?

the first thing to check is the fuse. If you don’t know where the…
check the fan wires. Start by unplugging the wires.
Temperature Sensor. The temperature sensor determines when the radiator fan comes on by reading the cooling system…
Coolant Level. Check the coolant level in your engine. The simplest way to do this is to look at the reservoir in the…

Why do I need to check my cooling fan relay?

The cooling fan relay essentially functions as the switch for the engine’s cooling fans; and is therefore an important electrical component of the vehicle’s cooling system. Finally, if you suspect that your cooling fan relay, may possibly be having issues, have it checked.

How can I tell if my engine cooling fan is working?

So, the easiest way to check it is visually. Check it for a continuous wire with no breaks. Using a multimeter is another good way. So, if you find a blown fuse replace it. That may be all you need to get back on the road. But, If The Fuse Is OK, Move On To The Next Step.

What happens if one fan fails to come on?

If one or both fans fail to come on; the lack of additional cooling provided by the fan may cause poor A/C cooling performance. Also, it may cause the A/C compressor to overheat and fail. The engine may also run hot and overheat, too.

How can I tell if my AC fan motor is bad?

Check the power If you suspect the fan motor is bad, the first thing you should check is the power to the motor and the power to the air conditioning unit. Locate the circuit breaker and ensure it hasn’t tripped. If the power is fine, check to see if there is proper voltage.

What are the symptoms of a bad radiator fan?

$0.00 1 Cooling fans do not come on The most common symptom of a faulty cooling fan motor are cooling fans that do not come on. 2 Vehicle overheating Another symptom of a possible problem with the cooling or radiator fan motors is the vehicle overheating. 3 Blown fuse

Why do I need to test my engine cooling fan?

So, cooling fan motors are an important component to any engine cooling fan assembly. And, play a key role in keeping the car at safe temperatures, during idle and low speeds. Finally, if you suspect that your cooling fan motors may be having an issue; do some testing to see if you can fix it yourself.

Check the power If you suspect the fan motor is bad, the first thing you should check is the power to the motor and the power to the air conditioning unit. Locate the circuit breaker and ensure it hasn’t tripped. If the power is fine, check to see if there is proper voltage.

So, cooling fan motors are an important component to any engine cooling fan assembly. And, play a key role in keeping the car at safe temperatures, during idle and low speeds. Finally, if you suspect that your cooling fan motors may be having an issue; do some testing to see if you can fix it yourself.

How can you tell if a fan or capacitor is bad?

That being said, it could be tricky to figure out whether the issue is the fan or the capacitor since the capacitor is the part that provides the energy for the fan motor to operate. One way to know for sure is to turn off the power to the unit and unscrew the side panel to inspect the capacitor .

What should I do if my fan is running at full speed?

Another potential solution to your fan problem is to stop acting as a P2P server for the rest of the world’s Windows 10 installations: Search for Check for updates in the Start menu. Under Windows Update choose Advanced options. Under Choose how updates are installed click Choose how updates are delivered.

What to do if your engine fan won’t turn off?

13 people found this helpful. If the fan switches off by itself after about 10 minutes, it is working properly. MK4 (1999-2004.5) VWs have an after run feature to cool the engine after shut down if the coolant temperature is too high. 36 people found this helpful.

13 people found this helpful. If the fan switches off by itself after about 10 minutes, it is working properly. MK4 (1999-2004.5) VWs have an after run feature to cool the engine after shut down if the coolant temperature is too high. 36 people found this helpful.

Why are the fans running even when the engine is offline?

Conversely, the cooling fans may keep running even when the engine is offline. This odd behavior indicates a different issue in the relay that controls the fans. An electrical short in the relay can lock the armature in its open position permanently.

Why does my PCM not turn on the fans?

You are looking to see if the PCM sends power to one or both relays to turn on the coolant fans. This should happen as the high side of the system approaches 214 psi. If it exceeds this amount of pressure and the system doesn’t turn on, one of the sensors in the system that the PCM uses to know when to turn the system on and off has failed.

Can a bad fan motor cause a breaker to blow?

CAUTION: If the fan fuse or fusible link is blown, or the breaker has been triggered, it is possible the fan motor itself may be bad and causing the fuses to blow. Replace the fuse or fusible link, or reset the breaker, and test the fan motor again. If the same problem appears and there’s no wire causing a short circuit, replace the fan motor.

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.

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

Pick the last option: POWER FAN SPEED and change it into IGNORED. And then, generally, the computer will not give such CPU fan error message again. But, if your computer BIOS settings of the CPU fans are not changed, also do not worry. Just go to the next step. 2). Check whether the CPU fan works well with proper speed

Just had my cummins isx inframed with a new head and brought it home notice the fan would not disengage.unhooked air line to fan clutch it moved in and out checked for power to solenoid and no power with key on could not find any broken wires now stumped anyone with any ideas. Every month 400 people find a job with the help of TruckersReport.

What makes an engine fan not turn on?

Engine thermostat is stuck OPEN (engine never gets hot enough to turn on the fan) A wiring problem (blown fuse, loose or corroded connector, shorts, opens, etc.) On most systems; there is a coolant temperature switch that turns the fans on and off.

What causes a fan motor to go bad?

One more thing before you start testing. The top cause of fan motor ‘breakdowns’ is a bad run capacitor. Always visually check the capacitor before you start testing because ruptured capacitors and capacitors with dents or any other types of deformities are obviously broken and you need to replace them as soon as possible.

What happens when you test a fan motor?

Always visually check the capacitor before you start testing because ruptured capacitors and capacitors with dents or any other types of deformities are obviously broken and you need to replace them as soon as possible. It goes without saying that everything is probably fine with the fan motor if you detect such a capacitor.

If you are using a remote control, check that the batteries are installed properly and are not dead. Check that the dip switches on the remote and receiver are set to the same frequency. If you’re using a wall control, check the power to the breaker from your control and try working your ceiling fan manually.

How can I tell if my electric fan is still working?

If you don’t hear anything, put your ear up to the middle of the case behind the blades. Press the button to turn the fan off and on again, this time listening closely for the motor. If you hear it humming or buzzing, your motor is likely still functioning. Check the fan in multiple outlets.

If you don’t hear anything, put your ear up to the middle of the case behind the blades. Press the button to turn the fan off and on again, this time listening closely for the motor. If you hear it humming or buzzing, your motor is likely still functioning. Check the fan in multiple outlets.

What should I do if my Ceiling Fan remote is not working?

Most serve as light switches as well as turning on the fan and adjusting its speed. If your ceiling fan isn’t working, there may be a problem with the remote control. This ceiling fan remote troubleshooting guide reviews the standard problems with remote controls and how to fix them.

What causes a ceiling fan to stop working?

Follow the steps below to determine the cause: 1 Confirm the reverse switch is not in a neutral position. 2 If you have an older ceiling fan, the switch may be worn out. 3 If you are using a remote or wall control to reverse the ceiling fan, confirm the dip switches on the control and receiver are set to the same frequency.

What to do if your Honda AC Fan is not working?

DO this easy check First! If your Honda Fans aren’t working it can be easy repair. I found that both the radiator fan and the AC fan weren’t working. or replace the fans, relays, temperature switch or even the fuses. The temperature switch is an easy repair and it’s even easier to replace. You can get the part from Amazon.com for cheap!

What to do when your car cooling fan comes on?

Consult your vehicle repair manual to check the required sensors and switches. On a warm engine, the fan may come on even if the engine is not running. When working on a hot engine or an engine that is running, keep your hands and tools away from the fan blades and moving components. Locate cooling fan circuit components.

What does check engine light mean on air conditioner?

The check engine light illuminating may indicate a faulty cooling fan relay. A faulty cooling fan relay can also negatively affect air conditioning (A/C) performance.

Can a low coolant light cause a check engine error?

The PCM and Low Coolant Low coolant in the radiator of your car can trigger the malfunction illumination light (MIL), also known as the “check engine” light. Low coolant can affect the internal temperature of the engine, which is protected by the antifreeze.

Navigation