k guys my car overheated once in traffic because the fans never kicked on. I found a fuse which was blown in the engine bay box for the "A/P - Fan" and replaced it. That made it so the fans kicked on when I would turn the A/C on but that was it. I recently replaced my waterpump and replaced the Coolant temp sensor which is inside it. My fans still do not turn on at all(except when the A/C is on). I waited until the engine got to 230-240 ish and still nothing. Checked all relays for fans #1,#2, and #3 all work fine. They do not turn on when I jump the #5 and #6 cables on my OBDII port also.

What else can I do?

Car is a 1996 Formula lt1 w/ only 30k on it.

Something tells me the answer is behind what caused that "A/p - Fan" fuse to blow, but I dont know. This problem has been going on for a while and I just drove it by using the A/C as a fan switch when the car was hot I would just turn the AC on to get the fans to come on at low speed.

Nobody can give me an answer on what to test or do. Please help.

 

Since the fans work when the A/C request is given, you need to monitor the fans coming on at the exact temperature. You can't use the dash gage since it uses a different sensor than the PCM uses and it is usually inacurate.

The fans should come on low speed speed at 226 deg F. and at high speed at 234 deg F. Use a scan tool to confirm the temperature that the PCM sees from the coolant temp sensor. In the case of the sensor lagging behind actual temp. Monitor the actual temp if possible with another mechanical gage.