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The fact that the fans operate when in the A/C mode means that there is nothing wrong with the fans themselves or any of their associated relays. The PCM controls the activation of the fans at all times, whether it is due to the A/C controls being on, or from sensing the coolant temperature. Thus, I'd say your problem is in the Coolant Temperature Sensor circuit. Either the replacement sensor you purchased is bad (not as likely) or there is damage in the wiring or possible the PCM itself for the circuit.
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https://www.youtube.com/watch?v=fVVmB92VCKc
May 30, 2013 - Uploaded by B3NN10N
I will show you how to test both the fan switch and thetemperature sender. ... Sensor on the top rad hose ...
Jul 18, 2012 - Hi , (1977 GL 1000 ) Need some help on my fan and the temp gauge not working.. How do I go about testing the fan ? I want to try the easiest ...
AnandTech
Mar 28, 2009 - 12 posts - ‎6 authors
when A/C off, radiator fan does not turn on automatically ... to overheating (assumed to be correct as temperature gauge appears working when car is warming up) .... In mycase, the fans run, but the engine still overheats.
The fan that works with the a.c on is called the auxillary fan. Theres the primary fan that should come on automatically. Check the temperature sensor it could be faulty. Locate the temperature sensor and disconnect it. If the fan comes on go ahead and replace the sensor.
run fault codes to check for coolant temperature sensor that controls the fan operation and the fan relay . Check both fan fuses . Check that the fan spins freely. Temp range for the fan operation is around 80 degrees C turn on and runs until coolant temperature is well below this
ABSOLUTLY:TURN ON THE AC THE AC AUTOMATICALLY TURNS ON THE FANS IF THE FANS ARE OPERATING DO THIS FOR A TEST IF THE FAN OR FANS DO NOT COME ON YOU HAVE OTHER PROBLEMS!?
The coolant sensor from top of the engine near the air filter, not the one in the back of the engine, will turn the fan on when it indicates temperature hot or open. Take off the connector when the engine running then the fan should turn. If it is the case then the fan motor is good. All you have to do is to replace the coolant sensor.
Is the heater nice and hot when the needle shows low temp? If the cooling fans turn on and the heater is hot, that leads me to believe the coolant temperature sensor is bad. You should try replacing that sensor. They are only $6 usd here. As long as your check engine light is not on and your fans are running, this will not hurt your car... but this is something you should fix soon if you can. Make sure the engine is cold when you replace the sensor
MOST OF THE TIME IF THE COOLING FAN FAILS TO OPERATE.THE COOLING FAN RELAY OR FUSE IS BAD.ALSO THE COOLANT TEMPERATURE SENSOR IS OPEN.THE COOLANT FAN WONT TURN ON.TO HELP YOU PIN POINT YOUR PROBLEM.GET IT SCAN.IT WILL TELL YOU IF THE COOLING FAN CIRCUIT IS WORKING OR YOU HAVE A BAD COOLANT TEMPERATURE SENSOR.YOU NEED THESE TWO COMPONENTS TO GET YOUR COOLING FAN TO OPERATE AUTOMATIC AGAIN.
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