Question about 1990 GMC Sierra

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No power to the heating and air conditioning controls

I have a 1990 GMC Sierra that has no power going to the controls for the heating and air conditioning. I checked the fuse and it was fine, replaced it anyways but still no power. Not sure if it is related but the battery was dead so we had to jump it to get it going. New battery but every once in a while (if not driving every day) the battery drains.

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  • Anonymous Dec 09, 2008

    i have a 1990 gmc and the blower motor went out so i bought a new one and now the control panel will not work for the heat and a/c i got a new one and it still will not work the wires got hot and had a small fire that is why i had to replace the blower motor so do not know if the wires got burned somewhere from the blower to the control panle are not

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To answer you draining power problem, check your altinator, it can be on its way out

Posted on Dec 28, 2008

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Folliottfami:I take you to mean that the blower just does not run. Your problem may have something to do with the motor being bad, or a wire or terminal between the relay/resistor and the motor breaking down and maybe burnt off. I can't say what is draining your battery though. Those problems usually stem from a light, such as the one in the glovebox, staying on.

Guest:: your problem may be similar. Inspect the wires and terminations in the area of the relay/resistor assembly.

Posted on Dec 19, 2008

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