View Full Version : whay sensor is responsible for turning on the cooling fans
08-16-2009, 12:26 PM
its not the engine temp sensor,and i cannot figure it out. any help appreciated
08-19-2009, 05:03 AM
This has all the information you need including a temperature sensor resistance chart.
08-22-2009, 12:28 PM
The pcm turns commands the fans on or off based on several things such as coolant temp, vehicle speed, and A/C pressure.
08-22-2009, 01:21 PM
Its a 99, the relay system has failed, very common on 99 GA GT's. Hell mine did it too. You have two options, get the harnesses, relays and install them with a new tune on the PCM or just the caspers fan switch and turn them on and off when you need them.
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