Question about 2002 Pontiac Grand Prix

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2002 pont. grand prix-Heater/AC Only works on High

Heater/AC Unit only works at the highest speed of 5. Is this an easy fix or do you have to go to the dealership?

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  • carol_wilson Jan 15, 2009

    The information appears to be perfect as I spoke with a few electrical engineers I work with and they agreed with the solution of the resistor. I have ordered it and the electrical engineer will put it in for me for $20. save me about $130 bucks from the dealer. It will take a couple of weeks to get the part. I will let you know when its done.

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You need a new speed control resistor... this is something you will have to get from the dealer, but you should be able to replace it yourself - it is under the dash on the passenger side mounted near the bottom of the fan motor.. you will remove a couple of screws, and it will come out of the black casing it is mounted inside.

Posted on Jan 12, 2009

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As emissionwiz stated, that is the most common cause.
This resistor may be mounted on the firewall under the hood or near the blower motor. 
Without an electrical diagram at hand, I can't say for sure but there may be a relay failed that bypasses the resistor completely when set on the highest speed or diverts the current through the resistor. 

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