Question about 1993 Pontiac Grand Am
If the fans run when the sensor is unplugged there is nothing wrong with the relays. The computer automatically runs the fans when it recorded no info from the sensor to avoid overheating. The temp sensor is faulty. The ac compressor is not on the same circuit, it is not running because the sensor is unplugged and the computer is not able to determine coolant temp and disables the ac to avoid overheating.
Posted on Mar 11, 2011
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Posted on Jan 02, 2017
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The engine coolant temperature sensor provides an input voltage to the PCM. As the coolant temperature varies, the sensor resistance changes resulting in a different input voltage to the PCM.
When the engine is cold, the PCM will demand slightly richer air/fuel mixtures and higher idle speeds until normal operating temperatures are reached.
The engine coolant temperature sensor is also utilized for control of the cooling fan.
Fig. 1: Engine coolant temperature sensor location - 3.3L and 3.8L engines
Check this test procedure:
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