Quote:
Originally Posted by jp988
my fan works with ac and when i unplug connector but will not come on by itself. temp will rise but not overheat. I just changed thermostat with no luck. Any ideas? 2001 Lumina.
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the fan works so that is not the problem. the ac on the fan comes on this is normal.
with the ac off the fan comes on due to the temp reported to the PCM/computer. you must chenge the temperature sensors that reports this to the PCM.
these can cause the fan to come on when first starting in very cold weather[run all the time] or will not come on as the engine temp rises too far. the guage sender can also be defective.