Question about 2002 Pontiac Grand Prix

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Heater motor only runs on high

I have a 2001 Grand Prix. The heater motor only runs on high which is 5 on the heater switch. It does not run on numbers 1-4. Any suggestions on what to check? Could it be the switch or something else? I did tap around on the heater speed control switch and it worked until the next time I used the car. Any help would be great!!
Thanks

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  • heavychevy72 Dec 28, 2008

    Thanks for the help. It solved my problem.

  • rcalupe Dec 29, 2008

    how do i relace the heater blower resistor?

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Replace the heater blower resistor.

Posted on Dec 26, 2008

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The Circuits for your other blower speeds go through the ignition switch along with the DRL control module, but your HIGH speed does not. So if it is your ignition switch, your HIGH speed should still work and your regular headlamps should still work. You will lose only your lower blower speeds and DRL if it is an ignition switch problem. You will have a bunch of other stuff going out if it is an ignition switch also. The ignition switch circuit that runs your DRL module also runs your Powertrain Control Module. So if it is an ignition switch problem causing your DRL to shut down, your engine will also be shutting down.

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