Question about Cars & Trucks
Well, this is a pretty basic system, You have a temperature switch, a relay, fuses, and the motor. If you can find the fan relays and have a test light, remove the relay and verify that you have 12v going to the relay. Then locate the temp switch and verify you have 12v to it. If no one either of these check that the fuses are good. If the fuses are good and you have power to everything make sure your switch is working by using an ohm meter. unplug the switch and take a reading between the poles that are in the switch, start the engine and let it warm up and keep taking reading as it warms and look for the ohms to change, or get lower. you should end up with continuity at the switches set point that should be somewhere between 180-215 depending on your vehicles spec. If the switch is good you should be able to hear/ feel the relay click when you plug the wire back onto the switch when the engine is up to operating temp and the switch is active. If the switch does not close at temperature replace the switch, if the relay does not click when the switch is active replace the relay. If the fan still does not work then you might get some extra wire and make a jumper that can go from the battery to the plug on the fan itself and make sure the fan runs.
The way the system works is the temperature switch closes at a certain temp and sends a signal to the relay which closes and sends a strong 12volts to the fan motor. If your car has Air Conditioning your fan should kick on when you turn your air on as well, the fan aids in condensing the refrigerant in the AC condenser that is in front of the radiator. If the fan does not come on when you turn on your AC, if the vehicle is equipped, the I would start at the fan motor itself.
Posted on Apr 20, 2013
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Posted on Jan 02, 2017
SOURCE: cooling fan
Yes, it's probably the PCM. I had the same problem, and upon replacing the PCM it started working again. If your cooling sending unit is new, and so many parts of your fan assembly are new, it's probably not receiving the signal from the sending unit. Hope this helps.
Posted on Jul 22, 2009
SOURCE: 1997 sunfire 2.4 engine
I have replaced the sensor plenty of times to correct this problem. Even when the gauge was working and the check engine light was off. Also I have just unplugged and plugged the sensor and got them to work. Try this first.
Posted on Jul 16, 2011
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