Troubleshooting Electric Cooling Fan Problems in Cars

Updated on January 23, 2019
Dan Ferrell profile image

Dan Ferrell writes about do-it-yourself car maintenance and repair. He has certifications in automation and control technology.

Testing a failed cooling fan circuit can be tricky at times.
Testing a failed cooling fan circuit can be tricky at times. | Source

Cooling fan problems can be hard to diagnose, depending on your vehicle model and the type of failure. Still, you can avoid much of the confusion using a troubleshooting plan.

If your electric radiator fan isn't coming on after the engine reaches operating temperature—the key here is operating temperature (more on this later)—you can bet there's something wrong with the fan assembly itself, the circuit, or one of its components.

This guide walks you through some of the most common electric cooling fan problems to help you troubleshoot and identify the problem when the fan refuses to work, or works intermittently.

On older vehicle models, the fan circuit is simple, and you may not have trouble locating operating components or the fault itself.

Modern vehicles use the electronic control module (ECM-car computer), powertrain control module (PCM), or a dedicated fan control module (or both) to control the operation of the radiator fan, and can be little more complicated to troubleshoot sometimes.

So, with newer vehicle models, it's a good idea to have the vehicle repair manual for your particular make and model on hand, especially with fairly recent models. The manual explains the operation of the cooling system, how your cooling fan operates, and the sensors or switches your car computer reads from to operate the cooling fan. Besides, the manual can help you locate sensors, relays, switches and trace circuit wires as necessary. Haynes makes good aftermarket manuals.

If your engine is overheating and you suspect problems with the cooling fan, this guide gives you important troubleshooting tips, and the steps to diagnose the most common cooling fan failures you are likely to encounter on your car.

Before going into the necessary steps to troubleshoot the fan in your vehicle, though, a brief fan operation description follows.

In This Article:

Cooling Fan Operation

Troubleshooting Shortcuts

Cooling Fan Troubleshooting

  1. Has Your Cooling Fan Actually Failed?
  2. How to Test the Cooling Fan Motor
  3. Checking Wires, Connectors and Related Components
  4. Testing the Cooling Fan Temperature Switch
  5. Testing a Cooling Fan Relay

Cooling fan helps control engine and other components temperature in the engine compartment.
Cooling fan helps control engine and other components temperature in the engine compartment. | Source

How the Cooling Fan Works

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.

The electric cooling fan uses a direct current (DC) electric motor with a thermo switch, module or computer control to turn it on or off, depending on coolant temperature or AC operating condition.

On older fan circuits, the thermostatic switch connects to battery power on one side, and to the fan motor on the other. However, on most '90s and newer models the control was passed to the car computer or a dedicated module. For example, when coolant temperature changes, the thermo switch reports this change to the computer through a voltage signal, which the computer or module uses to activate the cooling fan through a fan relay(s).

An electric cooling fan not only helps save energy by running only when the system needs to remove excess heat away from the engine, but helps shield other sensitive circuits and electronic components from heat damage. During the winter months, your radiator fan saves even more energy when enough cool air flows through the radiator on the highway.

Even if your cooling fan doesn't have a complicated circuit, you still need to know where to look when your fan doesn't work as expected. Next are some fan circuit key points you need to check when diagnosing problems with your electric cooling fan.

Some Troubleshooting Shortcuts

1. If you think the cooling fan isn't working because your temperature gauge is indicating overheating, open the hood, start the engine, and let it idle for 15 to 20 minutes. If the fan comes on, you may have a bad temperature sensor or gauge.

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. On some modern vehicles, an ambient air temperature sensor, vehicle speed sensor, and other sensors may provide input to the car computer to determine radiator fan operation. Consult your vehicle repair manual to check the required sensors and switches.

Warning

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.
Locate cooling fan circuit components. | Source

Troubleshooting Your Cooling Fan

Troubleshooting a cooling fan that doesn't work can be a relatively straightforward task at times. Usually, the problem resides with the fan motor itself, a thermo switch, relay, wire, or (less commonly) the computer or module itself.

1.Has the Cooling Fan Actually Failed?

On many modern vehicles, if you want to confirm whether your cooling fan is in working order, you can start the engine and let it idle. Set your air conditioning to the MAX setting and turn it on. The cooling fan should come on immediately or within the next couple of minutes. On older vehicle models, just wait about 15 to 20 minutes for the engine to reach operating temperature. Then, the fan should come on.

  • 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 or switch that sends the signal to the computer or module to operate the fan. On modern vehicles, a bad sensor usually triggers the check engine light. Scan the computer for trouble codes, if necessary.
  • If the fan fails to come on, first check for a fan blown fuse or triggered breaker. On older vehicle models, you may have a fusible link in the circuit. This is a piece of wire inside an insulated block of rubber. You won't miss it. Grab the ends of the fusible link and try to stretch it. If it stretches, the wire link might be broken. Replace it.

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.

NOTE: if the cooling fan doesn't come on when the engine has been operating for 20 minutes or more, make sure that coolant is reaching operating temperature, around 220°F (104°C). You may be dealing with a stuck-open thermostat. Check the temperature of the engine block and radiator tank (the one that connects to the engine with the upper radiator hose) using a kitchen thermometer. Make sure that engine temperature reaches about 220°F (104°C) and the radiator tank temperature rises accordingly (meaning hot coolant is being transferred to the radiator). If temperature remains fairly steady around 200°F (93°C) or less, the temperature switch or sensor may fail to trigger the radiator fan on.

Connect fan directly to power for testing.
Connect fan directly to power for testing. | Source

2. How to Test the Cooling Fan Motor

If the fan fails to come on, you still can check the fan by connecting direct battery power to it (while working and making tests in the proximity of the fan, always stay clear and keep tools away from the fan).

1. Unplug the fan wiring connector. Closely examine the connector for corrosion or damage. If necessary, use electrical contact cleaner to clean the connector. Make sure the wires are firmly attached to the connector and not damaged.

2. Look at the polarity of the wires leading to the fan, identify power and ground (usually a black wire).

3. Using jumping wires, connect battery negative to the ground side of the fan connector and positive battery to the other wire. On some vehicles, the fan connector comes with three terminals, two for power (high and low speed, test both) and another for ground. Or you may have a four-wire terminal (high and low speed and two grounds, test each pair separately). Consult your vehicle repair manual to identify each wire, if necessary.

4. Once you connect the fan to battery power, your fan should start running.

  • If the fan doesn't work with direct battery power, examine the terminal that plugs to the radiator fan connector. Look for corrosion and damage. Then test for incoming voltage at the terminal with your digital multimeter (DMM). With the engine running and at operating temperature, touch the terminal positive and ground with the respective multimeter probes, you should get running voltage (about 14V), indicating the fan should be running. If your test proves incoming power, replace the fan motor.
  • Check for any blown fuses or a tripping breaker. If your find a circuit blown fuse or tripped breaker, the fan motor might be pulling too much voltage, causing the fault. Check for a shorted wire or replace the fan motor.
  • If the fan doesn't come on at all, or runs noisy or at an abnormally low speed, replace the fan motor.

Still, on some vehicle models, you can unplug the single wire connector from the coolant temperature switch to trigger the cooling fan on, or by grounding the wire using a jumper wire while the vehicle is running. Just keep in mind that your computer may set a trouble code for a malfunctioning temperature switch

The video at the bottom of this post gives you a visual guide to troubleshoot the temperature sensor and fan motor.

3. Checking Wires, Connectors and Related Components

If the cooling fan motor and fuses, breakers or fusible links seem to be in working order, it's time to check the circuit and related components. You may need to consult your vehicle repair manual to locate components and wires in the circuit.

Try to follow the fan wires back to the coolant temperature switch or cooling fan relay on modern vehicles. Closely examine the wires for cuts or damage.

Sensor(s) in the cooling fan circuit handles the signal to turn on the cooling fan.
Sensor(s) in the cooling fan circuit handles the signal to turn on the cooling fan. | Source

4. Testing the Cooling Fan Temperature Switch

Consult your vehicle repair manual to locate the switch, if necessary. On most modern vehicles (late '90s and newer), you are looking for the switch that connects to your car computer (powertrain computer), since there may be more than one switch.

You can test the cooling fan temperature switch using a test light.

1. Connect your test light to battery ground.

2. Start and idle the engine, and backprobe the connector terminals with the test light. One of them should turn on the test light.

3. Wait for the engine to reach operating temperature.

4. Now backprobe the other wire at the connector. Your test light should come on. Otherwise, the switch is not working.

NOTE: If your vehicle repair manual gives you the cold and hot Ohms (resistance) values for your temperature switch, you can test it with a digital multimeter. Test switch resistance with the engine cold, and after idling the engine for 15 minutes. Turn off the engine and test again. Compare values to the ones on your manual. If you don't have the cold and hot values for your switch, you still may want to test the switch and compare the difference in values. This will tell you the switch is still working somehow.

Also, on newer vehicles the coolant temperature sensor operates the A/C and the cooling fan. If your vehicle repair manual gives the Ohms values at cold and hot condition, use your voltmeter to test the temperature sensor, if necessary. If you don't have the sensor's resistance values but you notice that Ohms remains pretty much the same at cold and hot, replace the sensor.

Test the fan relay for operation.
Test the fan relay for operation. | Source

5. Testing a Cooling Fan Relay

  • The easiest way to know whether your relay is causing trouble is to replace it with another relay in your vehicle you know is working fine. Look at the power center under the hood for a similar relay that won't interfere with the correct operation of your engine if swapped, like a window or wiper relay.
  • If you can't find a suitable relay, you still can test the relay. Go ahead and read the steps described in How to Test a Fuel Pump Relay. The steps are the same for your relay. Most fan relays come in one of three different configurations. Make sure to correctly identify the prong terminals on your relay. See the schematic printed on the relay itself or consult the schematic in your vehicle repair manual, if necessary. The schematic will help you also when checking the fan cooling circuit.
  • If swapping relays still doesn't operate your cooling fan, make sure the relay is receiving power from the computer.
  • Consult your repair manual to identify the wire that sends power to the relay. Usually, there's power to the relay even if the engine is off. You can use a test light to check for power here. Connect the test light wire to a good ground and probe the power terminal on the relay socket. Turn the ignition key to On, if necessary. The test light should come on. If there's no power, there may be a fusible connector hooked to the power wire that is at fault, or the computer is not sending power to the relay. Consult the circuit schematic on your repair manual to follow the wire back and keep checking for voltage as necessary.
  • If the relay is working, check the wire(s) and fan connector for damage.

When checking for cooling fan problems, a modern vehicle may present a challenge. Many modern vehicle models have a much more complex cooling fan circuit that the ones described here. Refer to your vehicle repair manual to locate wires, components, and modules, if necessary. Still, in some cases, you need to make a diagnosis using a professional scan tool to check for voltage values and power inputs to the cooling fan to locate the source of the problem.

This article is accurate and true to the best of the author’s knowledge. Content is for informational or entertainment purposes only and does not substitute for personal counsel or professional advice in business, financial, legal, or technical matters.

Questions & Answers

  • My cooling fan is not working on overheating, but it works with A/C. Why is this?

    You may want to check the coolant temperature sensor.

  • I’ve replaced the coolant temperature sensor and switched the fan relays and still no fan. I know my fan works cause when I unplugged the sensor it came on. What could be the problem with my electric cooling fan?

    Usually, the problem is with the fan control module. Check for trouble codes, even if the check engine light is not on. On rare cases, the problem is traced back to the car’s computer.

  • So when I get my 2008 GMC Acadia up to temp with AC running and when the cooling fan kicks into high, it blows my 30a fan 1 fuse. When ii started, this fuse issue, both fan 1 30a, and fan 2 40a were blown. Now the 40a hasn't blown, and its currently 80 degrees out. What should I do?

    Check the relays and connectors for the high-speed circuit. There could be a loose wire or the relay may be faulty.

  • What would cause my cooling fans to stay on even when the vehicle is cold?

    Unplug the cooling temperature sensor. If the fan stops, replace the sensor.

  • My 1995 Accord’s fan only runs after I shut the motor off. I’ve replaced the fan timing unit, switch, thermostat, and tried swapping relays and topped it off after bleeding the coolant system. What do I do next?

    Maybe there's a problem with the thermocouple sensor. But you need to have the diagram for the circuit and follow the voltage to see where is or isn't going.

Comments

    0 of 8192 characters used
    Post Comment
    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      10 days ago

      Have the alternator checked. It might not responding properly when the load increases. Just to make sure, check the charging circuit voltage drop, to see the condition on the wires and connectors.

      https://axleaddict.com/auto-repair/Charging-System...

      Other possibility is a faulty fan motor. Hope this helps.

    • profile image

      Rwhr 

      10 days ago

      I have a vitz ksp90 model. Every time cooling fan starts engine getting wobbly. After it turned off its become okay.

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      2 weeks ago

      Check the cooling fan temperature switch or sensor. It might be stuck.

    • profile image

      Mekonnen Seid 

      2 weeks ago

      Hi Sir. Currently I purchased used toyota vitz 2001 model car. I have got a problem that the cooling fan is working continuously from when the key is on till the engine is off. I think it works abnormally. Sir what is the cause od this problem? Should I stop the car or can drive with tilhis problem. Pls. Help#

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      5 weeks ago

      There might be too much resistance in the circuit. Look for loos or corroded wires-connectors. If necessary, check the engine grounds.

      https://axleaddict.com/auto-repair/Automotive-Volt...

    • profile image

      Sean 

      5 weeks ago

      When my AC is on, my corolla fan is always spin low till the engine gets hot..

      During idle the fan always take long before it comes up.

    • profile image

      Amyia Adans 

      5 weeks ago

      My son will come on but it'll run slow and stop.

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      3 months ago

      If fan motors are working, and voltage is present at the plug, then the problem could be in the circuit. Check the relays, temp switch.

    • profile image

      GearheadRA168E 

      3 months ago

      2002 acura rsx auto (overheating)radiator cracked while driving replaced with a new one and switched everything from old to new radiator components but took off the a/c condenser and now, car starts good idle for about 10min and starts overheat fans dont come on, i checked fans motors itself work and fan plugs receiving voltage also checked fuses, wiring harness, havent checked the relays, fan or temp switches,thermostat..before the radiator cracked everything worked good

      Thoughts???

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      3 months ago

      Make sure the fan belt (if equipped) is not loose; check the belt that runs the water pump; listen to the water pump with a mechanic's stethoscope or a length of hose. If it is noisy, the bearing or impeller may be faulty. Check that the cooling fan is coming on when the engine reaches operating temperature. Also, make sure your coolant is still good and the system has enough coolant. Hope this helps.

    • profile image

      Todd 

      3 months ago

      Car runs hot idling but is fine while moving

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      3 months ago

      Make sure the engine is not overheating, causing the fan to come on. If not overheating, check for a faulty coolant temperature sensor.

    • profile image

      joel 

      3 months ago

      why does my radiator fan turn on when it want to? How do i fix that...

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      4 months ago

      I'm glad it helped. Thanks.

    • profile image

      Anonymous 

      4 months ago

      Hi, just wanted to say a big thanks! We were having some trouble with our car overheating on a road trip, and we had turned the A/C off along with anything else that we didn't need to have running, but it turned out that the fans weren't spinning when the car was overheating, so I guess it was a bad temperature sensor or circuit, but we turned the A/C on and were able to finish our road trip, so thanks!

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      4 months ago

      Check the manual for your particular model. The AC has a feed line to command, depending on configuration, the fan on (condenser or cooling fan). Low speed after AC is turned off most likely comes from AC.

    • profile image

      Robert1958 

      4 months ago

      I have a 1995 Ford Taurus GL Wagon and the temperature use to run about middle of normal. Recently it rose to the L in normal and I had flushed the system, changed both temperature sensors. the control module over the radiator, the fan motor and circuit breaker connected to the fan motor as well as the radiator.

      TEST MADE WITH A/C OFF, THEN WITH A/C ON

      I just checked the water pump with a long screwdriver and my ear to it, no noisy bearing sound, just low pitch steady hum, no leaks out leep hole. Coolant is flowing steady through radiator, [about the A in normal], just before fan comes on, coolant starts to rise through open neck,[ about the end of L in normal], of radiator then goes down into radiator again and flows through radiator no problem, [A in normal again] when fan is on. Put the A/C on after fan is off off and the fan goes on high, then I noticed when I shut A/C down, the fan is on a low speed for a little bit then goes off. I do not notice a low speed fan when my A/C is off, just a high speed fan when the gauge reads the end of L in normal.

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      4 months ago

      If the thermostat is old, you may want to replace it as well. You can listen to the water pump with a length of hose and see if the bearing or noises come from it. The impeller may be loose. Check the belt that runs the pump. That can also be a problem. Although not that common, the temperature gauge may also become faulty. Hope this helps.

    • profile image

      Robert1958 

      4 months ago

      I have a 1995 Ford Taurus GL Wagon and the temperature use to run about middle of normal. Recently it rose to the L in normal and I had flushed the system, changed both temperature sensors. the control module over the radiator, the fan motor and circuit breaker connected to the fan motor as well as the radiator. Only thing not replaced I know of is water pump. Still runs hot, between L and Hot on highway, fan is coming on about the L. Comes on when A/C is on. Can the water pump cause this? Only thing I have not replaced I think. Any Suggestions?

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      4 months ago

      Probably the fan bearing is getting dry or worn. When you spin the fan manually, your help the bearing overcome whatever gets it to stick. Probably you need a new fan motor.

    • profile image

      Malik Khalid 

      4 months ago

      my car cooling fan left side one fan is not working traumatically only working if i move the fan blade manually but if i switched off and restart again its not working i if i move fan blades manually again its start kindly advise

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      5 months ago

      Check the condenser for clogging (bugs, debris). It is located near the radiator and looks like a small radiator. Also, check that the system is still charged. Otherwise, check the compressor.

    • profile image

      Emma 

      5 months ago

      My 2007 Camry doesn't blow cold, but it blows hot when I turn the dial to heat, What could be the problem?

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      6 months ago

      You may want to take a temperature reading of the engine block and inlet radiator tank once the fans come on. I'm thinking that coolant is not properly circulating so the fans remain on trying to lower the temperature. Another possibility is a failing temperature sensor. A normal engine operating range is between 195 and 220F.

    • profile image

      GJA 

      6 months ago

      Hyundai 2006 Elantra radiator fans come on once car is warmed up and stay on until engine is off

      I'm trying to troubleshoot and also wondering can I just ignore this if there are no other problems. How much wear and tear is really going on if the fans stay on during driving? I've read that fans generally don't fail, but this seems like a lot of unnecessary spinning.

      I only noticed this because I did some maintenance on my coolant system. Not sure when the fan issue started. No overheating indicated on the temp gauge currently. There are no symptoms I'm noticing otherwise.

      I know that in the past the fans use to cycle on for 10-15 seconds and then go off while idling. Now they just stay on after the car is warmed up and don't go off until the engine is turned off.

      Climate control is off when I've tested the fans. A/C will turn on the fans immediately with engine cold and keep them on.

      Fuses are in tact. Not sure if relays could still be an issue. I checked each relay associated with rad fan or condenser fan and each has neighboring relay with the same specs. I swapped each corresponding one and fired up the car, no changes.

      Unclear if the ECT (coolant temp sensor) is malfunctioning. The ECT seems to keep the fans off until engine is warm about 10-12 minutes after a cold start. If I disconnect the ECT for a moment while the engine is still cold the fans go on. The fans also continue if I disconnecting the ECT while the engine is hot. So the ECT is doing some work it seems, but is it possible it or maybe something else is keeping the fans on?

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      6 months ago

      You can check the wiring diagram for your particular model. Get an aftermarket manual to trace the circuit. If you don't have the manual or don't want to buy one yet, check, the reference section of your public library, probably the have the manual.

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      6 months ago

      The computer monitors the signals from the sensor. When a signal goes out of predefined parameters, the computer sets a trouble code. Look for the definition of the code online and you'll get an idea about the problem.

    • profile image

      Christine C Atherton 

      6 months ago

      I got a thermostat sensor code on the OBD my question is could a relay cause the thermostat sensor code

    • profile image

      G.Balaji 

      6 months ago

      J 293 coolant fan control module p1672fan 1control circuit open circuit / short circuit to ground

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      10 months ago

      Not yet. At least. The fan problem may be related to the expansion valve and the overall operation of the AC. If you're going ahead and replace the compressor, go ahead. And talk to your mechanic about the fan operation. But I'd suggest to wait until you got the AC system up and running good. Hope this helps.

    • profile image

      Roody 

      10 months ago

      Hi, I have an 05 Dodge Magnum, I was trying to change the expansion valve myself and one of the bolt was broken and I was replaced it with just one bolt because I did not know if the bolt was mounted on a seal plate I thought I would have to remove the evaporator another for me to remove the bolt, I said I'm going to leave it with one bolt, I was scared to tell the A/C guy was going to vacuum and fill the A/C system for me. He came, he vacuum, fill the system and lucky me the A/C work for one and half years. After that I started to smell the Freon inside of the car and the A/C started to blowing hot air. I called the A/C guy again and told him to come check the A/C for me, before that I went ahead and put some A/C stop leak which worked for thee days, now I went to the A/C guy and I told him what I did before I went to him. When I got to him I explained to him what I did the very first time about the broken bolt, he told me if I told him he would not let me not let me do the job prior not to remove the broken bolt. He told me he got a good A/C stop leak could put that will fix it definitely but before he ad it into the system it is a must and imperative to remove the broken bolt first the Expansion Valve. Before he did the he ad some freon he told me he want to see how long it going to stay before the A/C the get hot again which he did, and it took it ten days the A/C got hot. I bought this Expansion Valve kit he replaced, vacuumed and filled the system but he told me as he replaced the part that was for him the main cause of the leak, he is not going to ad the A/C stop leak yet. He vacuumed/filled the system and he told me this time if the A/C got hot that's when he will have to ad the A/C stop leak. This time it was running a little longer for about three weeks. All these happened because I don't want to replace the evaporator. He always telling me that the A/C compressor is very weak because when the car is idling the A/C dosen't work good. Now my concern is the cooling fans, they works but it like they don't work at high speed like they used to. I don't know if it is because it's spring time it's not too hot. I had even turned the heater on, the fans just work normal. I did an experience, i unplugged the fans I accelerated the car and the temperature went up and I went and plugged the fans back and they kicked on in very high speed just once, after that they're running at low speed. Do you think the fans need to be replaced or not.

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      10 months ago

      The usually won’t come on until the engine is at operating temperature (around 190 o 210 degrees). Than it will run at low speed (mostly) or high speed to maintain coolant temperature. You can check the specs for your particular model using your vehicle repair manual. If you suspect something is not right you may want to check the engine coolant sensor or switch.

    • profile image

      sizar 

      10 months ago

      the cooling fan won't come on at 96° ...

      it start at low speed at 105° ...

      why ?

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      13 months ago

      Check for power to the relay with the ignition On first. Other possibilities is a defective or disconnected module. If there's no problem with the AC, you may use the diagram to trace for voltage. You can find the diagram in the repair manual for your vehicle. Use an aftermarket manual, if necessary.

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      13 months ago

      Check the temperature sensor. If the sensor is fine, check the wires. Make sure they are well connected, not loose.

    • profile image

      Kayla54701 

      13 months ago

      I have a 2006 Dodge caravan, I had the radiator replaced about 6 months ago my recent problem is the fan comes on when it's not even warmed up, once it comes on it seems to stay on until I turn my van off.

    • profile image

      Chinedu 

      13 months ago

      My Hyjndai Azera 2009 fan wont start, fan tested okay, relay tested okay, module tested okay. There seems to be no power to the relay and module. Been battling for 3days now

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      13 months ago

      Hi RR,

      It's possible. If you think the fan is running when it shouldn't check for possible DTCs, even if your engine light is not on. You may need your repair manual to check on some sensors.

    • profile image

      Rick Brooks 

      13 months ago

      On 2009 GMC with 5.3 L . Can the ambient temperature sensor cause electric radiator fan to run even when engine is overnight cold when AC is on for several minutes as I drive ?

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      14 months ago

      Hi RH

      Follow the voltage using a diagram. Both fans should come on at the same time - they're wired in parallel. Check where the voltage is stuck for that side.

      Sorry can't be of any more help.

    • profile image

      R Harris 

      14 months ago

      I have a 2006 Pontiac Grand Prix 3.8 Supercharged. I have replaced: Coolant temperature sensor, thermostat, PCM, Both fans (complete unit), Wiring from the fans to the relays and plugs oh and the relays yet the driver side fan still wont come on. Fans have been tested both the old and new (and they worked), but I can't get this fixed. Any suggestions?

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      14 months ago

      Yes. If the engine starts to overheat, you can end up with an expensive repair. So it's better to take a look at it now that can be much cheaper.

    • profile image

      shannon dillon 

      14 months ago

      it is a good idea to get someone to check it out if you have a problem with the fan cooling system

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      14 months ago

      It's possible there's a failing pressure switch in the AC. If you have a capable scanner, the circuit may be monitor to check the switches.

    • profile image

      Hamid 

      14 months ago

      Hi, I have Mitsubishi gallant v6 2004. My cooling fans does come on and with AC on they do increases speed but not to the max speed even when the engine is overheating. They stay on same speed without AC even if the needle is going above the middle. Only increases speed with AC on, but not very fast just little difference. If I unplugged the ECU wire from the module main connector they run full speed all the time and no heating issue.

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      17 months ago

      Hi RW,

      Sorry, I don't have the wiring diagram for this model but look for the fuse box, either under the dashboard or in the engine bay, ---firewall, driver's side possibly.

      Hope this helps

    • profile image

      Ray Waldin-Walker 

      17 months ago

      I have a 1992 Volkswagen Hatchback 1Lt petrol, "the old bread van", boils when reaches over temp, ok when air cools eng on a run till i stop. fan motor ok, checked with 12v source separate, changed rad sensor, no go where is rad motor relay?

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      19 months ago

      Hi Prasit,

      You need the wiring diagram for the cooling fan of your particular vehicle make and model. Recheck the connections you made and the fuses. It seems that somewhere you created a short. If you replaced the cooling fan, make sure it's the right one for your model. If you don't have the manual for your car, check the reference section of your local public library.

      Good luck

    • profile image

      Prasit 

      19 months ago

      My Toyota Soluna 1997 5A-FE 2 ECM's Resistor, Diode and transistor burnt out , after replaced plug into Car Cooling Fan running immediately and Magnetic Clutch of AIR Cond not be operated then ECM burnt in same position excluded Diode (Engine can be start and running)

      Would you please diagnoses the major shorts.

      Thank you

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      19 months ago

      Hi Mike,

      Basically the black wire is ground and the blue one is positive. I don't have the wiring diagram for your model, but I'm assuming you are connecting to the control module. Check the fuse and make sure there's power. If you don't have the service manual for your particular model, stop by your local public library. The reference section might have the manual for your model.

      Good luck.

    • MikeN70 profile image

      MikeN70 

      19 months ago

      I recently purchased a new Universal 120w cooling fan for my BMW 318iS. The wires from the car are brown, blue, another colour with a stripe in. The universal fan has only 2 wires, one black & one blue. Which wires need to be connected to allow the fan come on when the car gets hot.

      Presently the striped wire is not connected & after driving about 12 kilometers the temp gauge started to rise & the fan did not come on.

      Please help!

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      20 months ago

      Hi murlly

      It's possibly there's a short circuit or a problem in the cooling system. Try scanning for trouble codes, if necessary.

      Good luck

    • profile image

      murlly 

      20 months ago

      Tkz for good information ...my car problem model chevrolet nabira 1.8 sport cooling fan sometimes non stop run 30 minit sumting and aircond automaticly cut off.. after 30 minit normal running cooling function

    • Dan Ferrell profile imageAUTHOR

      Dan Ferrell 

      2 years ago

      Glad it helped.

      Thanks for the comment.

      Good luck

    • profile image

      Adam O. 

      2 years ago

      Man, this helped out a lot!! Well written / explained! Thank u.

    working

    This website uses cookies

    As a user in the EEA, your approval is needed on a few things. To provide a better website experience, axleaddict.com uses cookies (and other similar technologies) and may collect, process, and share personal data. Please choose which areas of our service you consent to our doing so.

    For more information on managing or withdrawing consents and how we handle data, visit our Privacy Policy at: https://axleaddict.com/privacy-policy#gdpr

    Show Details
    Necessary
    HubPages Device IDThis is used to identify particular browsers or devices when the access the service, and is used for security reasons.
    LoginThis is necessary to sign in to the HubPages Service.
    Google RecaptchaThis is used to prevent bots and spam. (Privacy Policy)
    AkismetThis is used to detect comment spam. (Privacy Policy)
    HubPages Google AnalyticsThis is used to provide data on traffic to our website, all personally identifyable data is anonymized. (Privacy Policy)
    HubPages Traffic PixelThis is used to collect data on traffic to articles and other pages on our site. Unless you are signed in to a HubPages account, all personally identifiable information is anonymized.
    Amazon Web ServicesThis is a cloud services platform that we used to host our service. (Privacy Policy)
    CloudflareThis is a cloud CDN service that we use to efficiently deliver files required for our service to operate such as javascript, cascading style sheets, images, and videos. (Privacy Policy)
    Google Hosted LibrariesJavascript software libraries such as jQuery are loaded at endpoints on the googleapis.com or gstatic.com domains, for performance and efficiency reasons. (Privacy Policy)
    Features
    Google Custom SearchThis is feature allows you to search the site. (Privacy Policy)
    Google MapsSome articles have Google Maps embedded in them. (Privacy Policy)
    Google ChartsThis is used to display charts and graphs on articles and the author center. (Privacy Policy)
    Google AdSense Host APIThis service allows you to sign up for or associate a Google AdSense account with HubPages, so that you can earn money from ads on your articles. No data is shared unless you engage with this feature. (Privacy Policy)
    Google YouTubeSome articles have YouTube videos embedded in them. (Privacy Policy)
    VimeoSome articles have Vimeo videos embedded in them. (Privacy Policy)
    PaypalThis is used for a registered author who enrolls in the HubPages Earnings program and requests to be paid via PayPal. No data is shared with Paypal unless you engage with this feature. (Privacy Policy)
    Facebook LoginYou can use this to streamline signing up for, or signing in to your Hubpages account. No data is shared with Facebook unless you engage with this feature. (Privacy Policy)
    MavenThis supports the Maven widget and search functionality. (Privacy Policy)
    Marketing
    Google AdSenseThis is an ad network. (Privacy Policy)
    Google DoubleClickGoogle provides ad serving technology and runs an ad network. (Privacy Policy)
    Index ExchangeThis is an ad network. (Privacy Policy)
    SovrnThis is an ad network. (Privacy Policy)
    Facebook AdsThis is an ad network. (Privacy Policy)
    Amazon Unified Ad MarketplaceThis is an ad network. (Privacy Policy)
    AppNexusThis is an ad network. (Privacy Policy)
    OpenxThis is an ad network. (Privacy Policy)
    Rubicon ProjectThis is an ad network. (Privacy Policy)
    TripleLiftThis is an ad network. (Privacy Policy)
    Say MediaWe partner with Say Media to deliver ad campaigns on our sites. (Privacy Policy)
    Remarketing PixelsWe may use remarketing pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to advertise the HubPages Service to people that have visited our sites.
    Conversion Tracking PixelsWe may use conversion tracking pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to identify when an advertisement has successfully resulted in the desired action, such as signing up for the HubPages Service or publishing an article on the HubPages Service.
    Statistics
    Author Google AnalyticsThis is used to provide traffic data and reports to the authors of articles on the HubPages Service. (Privacy Policy)
    ComscoreComScore is a media measurement and analytics company providing marketing data and analytics to enterprises, media and advertising agencies, and publishers. Non-consent will result in ComScore only processing obfuscated personal data. (Privacy Policy)
    Amazon Tracking PixelSome articles display amazon products as part of the Amazon Affiliate program, this pixel provides traffic statistics for those products (Privacy Policy)
    ClickscoThis is a data management platform studying reader behavior (Privacy Policy)