1999 Pontiac Grand Prix Logo
Posted on Aug 21, 2009
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A/C and heater only works on high

I have replaced the blowor motor and regulator and i still have the issue where it only blows on high (5) and my lower speeds dont even allow my a/c to be on at all.

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  • sabeteur Aug 21, 2009

    I replace the blower motor regulator which is located right next to the blower motor and both of those are brand new.

  • Steve Allison
    Steve Allison May 11, 2010

    Please define 'regulator.'
    Do you mean the speed setting itself?



    This type of failure (pretty common) is normally caused by a special kind of resistor that has taps for the different speeds.
    When these fail, only the ends of the resistor are still operative and that is the highest speed.

    There may also be an additional relay that connects to the taps when lower speeds are selected.
    If this relay fails, it could very well interfere with AC operation.

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  • Posted on Sep 24, 2009
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I had a problem like this on my 1999 grand prix gt. My headlights would cut out on any setting less then high (5), and my re-defroster wouldn't work. After ALOT of research I found out the it is the ignition wiring harness. I went to Advanced auto and they got me that for i think around $100ish. I hope this helps

  • Anonymous Oct 13, 2009

    This did work for me. It fixed all my problems... The heater/AC, redefroster, and headlights

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  • Posted on Aug 21, 2009
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Check your blower motor resistor, it may be bad.

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sample
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Blower Motor —Front Removal and Installation
  1. Prepare the vehicle for blower motor (19805) removal.
    1. Disconnect the battery ground cable (14301). For additional information, refer to Section 414-01 .
    1. Remove the air cleaner assembly. For additional information, refer to Section 303-12 .
  1. Detach the speed control servo.
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    1. Position the speed control servo aside.
  1. Position the coolant expansion tank/windshield washer reservoir aside.
    1. Remove the screws and the nuts.
    1. Position the coolant expansion tank/windshield washer reservoir aside.
  1. Remove the blower motor.
    1. Disconnect the vent hose.
    1. Disconnect the electrical connector.
    1. Remove the four screws.
    1. Remove the blower motor.
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Also,

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  • An overheating device (thermal limiter) will open the resistor coil circuit when the temperature reaches 121°C (250°F), interrupting the blower motor operation in all speeds except high.
  • The thermal limiter cannot be reset and is not serviceable.
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