Question about 2002 Pontiac Grand Prix

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Heat/ac blower only works on high! - 2002 Pontiac Grand Prix

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  • felixbag Aug 09, 2008

    I have a 1999 Grand Prix with the same problem. The ac only works on the highest setting. When I try the 4 lower settings there is no reponse from the ac plus my daytime headlights go out. This was happening in the winter with the heater also, the lights would also go out.
    Yesterday my husband replaced the blower resistor. And yes the new one did not look like the original resistor. We called parts to make sure we had the correct one.
    Well, that did not help, there is no change.


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My problem started the in a similar way but first the digital information center went blank, then the Fan only worked on 5, the daytime driving lights went next, and then even 5 on the Fan stopped working.

In my case is was the ingnition switch. I know this sounds strange, but I got the information from oher posts on here and had the dealer replace it and sure enough it fixed all of the problem, fan, DIC, and DDL.

It turns out that the ignition switch has all kinds of things routed through it, some that make sense and some that don't.

For me it was not a DIY job, I saw a 10 picture step by step guide on here someone posted and said forget that. It cost me about $350 to have it done by the dealer. The switch was $169 at dealer prices and the rest was labor. They waived the diagnostic fee since I was the one who suggested what the problem might be after they wasted a day scratching their heads. They did waive all of the labor time they put in chasing the wrong problem only becuase I had suggested the Ignitiion Switch on day one, but they did not listen...

Good Luck

Posted on Aug 14, 2008

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The resistor board is failing. If you wait long enough the blower won't work at all. The redesigned resistor board looks much better. The resistor board is next to the blower motor up against the firewall behind the glove box. If you follow the wire from the blower motor you should find it. I couldn't fully tighten the two screws up against the firewall due to the angle.

Posted on Jul 31, 2008

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