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2005 Pontiac Grand Prix Fans not turning on?


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Posted

I have a 2005 Grand Prix with a N/A 3.8L and the fans aren't turning on? What could be the issue? How can I fix this?

Posted

Fans are electric and controlled by the PCM. They are commanded to turn on when the temp. sensor reads -36F (don't ask why, just how it is) or 215-225F. If you're concerned about their function, turn on your A/C. They are programmed to turn on when you turn on the A/C as well.

Posted

Is the engine getting hot enough to kick the fans on?

 

It might be to cold outside or maybe a thermostat issue.

Posted
They are commanded to turn on when the temp. sensor reads -36F (don't ask why, just how it is)

A failed coolant temp sensor or harness will show approximately -40F. A reading of -40 can mean it's really cold out, or it can mean that the sensor failed. Since it wouldn't take long for a running engine to raise it's temperature above -36, the ECM assumes that a -40-ish reading indicates a failed sensor--and turns on the fan as a safety precaution.

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