Question about 2000 Pontiac Grand Prix

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I have a 2000 Pontiac Grand Prix GT. The blower motor only works in the High position. I replaced the blower motor resistor, but it didn't help. Shot the wires with a meter and get 11.8vdc through the resistor pack on High, and 10.2vdc on switch positions 1-4. I would have expected to have varying voltages on each fan setting from the resistor pack and into the blower motor. No shorts to ground or each other in the voltage wires. Very odd problem as the fan will run with 11.8vdc but not with 10.2 vdc and the new resistor pumps out the same voltage in all switch positions except high. Any ideas?

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I would check all fuses associated with the HVAC, if all fuses are good and you are sure the new part you bought is good then the problem would be in the control unit.

Posted on May 29, 2011

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  • arthor May 29, 2011

    I forgot to mention that I have good voltage going into the control, and good voltage coming out on all the fan setting legs (1-5). Good voltage going into the blower resistor on all wires, but strange voltage coming out: 11.8vdc on the High position which turns the fan on, but then 10.2vdc in all the other switch positions (1-4) and the fan does not come on. I'm wondering why I don't get different voltage drops from the resistor pack in different positions (on both the old and new resistor packs) and wondering why the fan will turn on with 11.8vdc but not 10.2vdc.

  • youngauto May 29, 2011

    Is this a manual system or an automatic temperature control? It is a separate power circuit for the high blower which is controlled through the control panel, you do not diagnose by voltages it is based on what component is working and what is not working.

  • youngauto May 29, 2011

    There can only be 3 solutions to your problem, bad fuse to control circuit, bad resister, bad control unit.

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