Question about 2005 Volkswagen Passat

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Cooling fan not working

The electric cooling fan is not coming on. i replaced the fan, but the new one stopped working shortly after pull away from the shop.

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The fan runs on a thermostatic switch that will not start the fan until it gets above operating temperature. This thermostatic switch needs replaced.

Posted on Jun 02, 2009

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Posted on Jan 02, 2017

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How do you force cooling fans to come on?


Water temperature needs to reach from 140 degrees to 160 for the both fans to come on. Both fans should come on when you turn on your a/c. You can hardwire a relay to the faulty fan but it is recommended that you take it to an electrical shop. If you feel comfortable rigging it yourself then I can guide you through the wiring process. You will need a relay with a relay socket or if a relay socket is not available, crimp female connectors will do. A soldering iron and electrical tape, along with wire strippers and cable ties. Keep in mind we are assuming the fan motor works and is not shorted out. If you are unsure, do not attempt to continue, for it can cause a fire or damage wiring. Do this at your own risk! Follow this simple diagram:


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Good luck!

Jun 25, 2012 | 2005 Dodge Grand Caravan

2 Answers

03 pt cruiser turbo - cooling fan is noisy.


Most electric cooling fans are noisy. They move large volumes of air to cool the engine. You will hear this noise most predominately when the fan spools up when you are stopped at a traffic light. As long as it is working and cooling the engine I wouldn't worry about it.

Mar 24, 2012 | 2003 Chrysler PT Cruiser

1 Answer

I have a 2000 chevy malibu with obvious electrical problems. blinkers and flashers rarely work, no dash lights, terrible radio signal, and car runs hot when stopped for too long. We Just replaced the fans...


Cooling Fan Operation
The Electronic Control Module (ECM) regulates the voltage to the cooling fan relay. The relay operates the fan when the engine coolant temperature exceeds 106°C (223°F) The cooling fan will turn on automatically during extended idle conditions under 5 miles per hour. For diagnosis and location of the relay, refer to Electrical Diagnosis.

Relay Driven Dual Cooling Fan Diagnostics

Electric Testing Techniques You Need to Know
Do you know what a wiring diagrams is ? free wiring diagrams here http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model and engine ! Under system click on engine then under subsystem click on cooling fans . Click the search button then the blue link .

Test the electrical circuits before replacing parts !
Basic Electricity for Service Techs Ohm law Current Flow Opens Shorts
How to Use Multimeter to Troubleshoot Common Problems



Jul 08, 2017 | 2000 Chevrolet Malibu

1 Answer

I have a 1995 Cabrio and the both cooling fans are not working. I found the fuse housing in the engine compartment however only one fuse was in there. I tried to put the other in (20) and it just...


Hi, look for the cooling fan switch on the radiator. It looks like the picture below. Pull the connector off. Turn the key on and connect the middle terminal in the connector to each of the other terminals using a short u-shaped wire. If the fans come on, replace the switch. Use water pump sealer or teflon tape on the threads of the new switch. You probably have only one fuse for the fans. The fuse box is used for many different models. Please let me know if you have questions, and thanks for using FixYa.
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Jan 05, 2011 | 1995 Volkswagen Cabrio

1 Answer

Heater fan works for a while then cuts off till it cools down




What can go wrong with a blower motor?
There are several things that may cause your blower motor to stop working. The simplest cause would be a blown fuse. If you replace the fuse and it quickly blows again, then you probably have an electrical short. Disconnected wires on the exterior of the blower motor can also cause it stop working, and if your blower motor gets dirty, it can get clogged or muddy which keeps the fan blades from spinning.

How do I test my blower motor?
When you are troubleshooting your blower motor, it is best to start by running the air conditioning or the heater to see if you can hear the sound of the fan. If you can hear the fan, it could be clogged or corroded with dirt. If you do not hear the fan, then you may have a bad resistor, blown fuse, or a loose wire. Next, you should replace any blown fuses in your car's fuse panel and try to start the blower motor again. If another fuse blows right away, you have an electrical short. If it doesn't blow out and the motor is still silent, then something else is wrong. In the case where the fuse lasts for a little while as the fan spins but then the fuse blows again, that usually means you need to replace the brushes on the motor. Finally, you can pull the motor out and visually inspect it for loose wires. If you don't see any and still want to test, try hooking it up to the battery to see if the motor will start. If all these tests still find you with a dead blower motor, it's definitely time to replace it.

How do I replace it?
Usually located under your vehicle's instrument panel, the blower motor can be removed and replaced. You'll need to disconnect the blower motor connector and remove the retaining screws holding it into place. Detach the fan retainer clip from the motor shaft that's located in the center of the blower wheel. You may need to save that piece if you are not replacing the whole motor. Inspect your new motor to ensure nothing is broken and the blades can properly spin. Re-attach the fan retainer clip, the retaining screws, and the connector so you can test your new blower motor out.

Dec 13, 2010 | 2001 Chevrolet Silverado 1500

2 Answers

The engine cooling fan will not stop. Battery was dead yesterday, needed new one, put it in, then fan started and would not stop (for hours)had to disconcect the battery. What is wrong?


  1. locate the engine cooling fan relay/disconnect/does fan stop
  2. if so reconnect relay
  3. locate fan switch in radiator or intake manifold
  4. disconnect switch/does fan stop?
  5. if so replace switch
  6. if not replace relay
  7. this solution does not check for electrical wiring problems
  8. such as opens or shorts to ground

Jul 27, 2010 | 1994 Honda Accord

1 Answer

Radiator fan won't shut off


Go into fuse box and pull out cooling fan relay this will stop fan.
Then check coolant temperature sensor(CTS) for resistance. You gonna need shop manual for this.
If sensor doesn't match up with resistance spec's replace. If it matches with specs then the only two items left are the relay you pulled and the wiring in the circuit. Test relay for shorts. Back probe wiring for shorts also. Good luck Its usually the relay. But I have replaced CTS's also.

May 07, 2010 | 2005 Honda Accord

2 Answers

I have a 94 Buick Regal Custom with a 3.8 V6 engine I just got a new battery two days ago and yesterday I was driving to work and my car started to overheat when I pulled into work and looked under the...


It may be that the coolant spraying from the open radiator shorted out the electric cooling fan. This would cause overheating even after refilling the antifreeze, and if the short is severe enough, could also drain the battery. Try charging the battery with a plug-in charger overnight, and remove the fuse for the radiator/cooling fan. If it starts up and runs as normal until it begins to heat up, this is probably the case. It would be a good idea to clean the whole engine with degreaser, being careful not to get it in the alternator, and to clean all electrical components with QD contact or electrical cleaner. It could also be a short in the heater fan circuit, but this is less likely. It is more likely that the draw from the heater fan took too much power away from the radiator fan, especially if the battery was marginal due to excess heat or shorting from having gotten very wet. Also, check that the polarity on the battery is correct, just for good measure.

Dec 17, 2009 | 1995 Buick Regal

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