Question about 2003 Pontiac Grand Prix

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SAME PROBLEM WITH MY 2003 GRAND PRIX

HEATER/ AC CONTROL SWITCH ONLY WORKS ON 5

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This is an ignition switch problem. Replace the switch. Don't mess with any other parts, there is a security sensor in there that is big money to get reprogrammed if you damage it and have to replace it. Sparky has the full procedure.

Posted on Nov 04, 2012

  • Evan Pallesen
    Evan Pallesen Nov 04, 2012

    This is an ignition switch problem. Replace the switch. Don't mess with any other parts, there is a security sensor in there that is big money to get reprogrammed if you damage it and have to replace it. Sparky has the full procedure.

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If you have replaced the resistor and it didnt fix the problem replace the ignition switch.

Posted on Sep 16, 2009

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Change the A/C resistor module underneath the passenger side glove box. I paid approx. $50 at Napa for this part and fixed it myself.

Posted on Aug 27, 2009

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Try replacing the fan resistor.

Posted on Jul 20, 2009

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once the motor is replace and the resistor replace all should be ok
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