Question about 2000 GMC Sierra

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My 2000 gmc sierra truck heater heats up but sometimes don't turn down

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  • leboeufbryon Apr 21, 2009

    the temperature heats up but won't cool down

    there's no problem with the fan

    or the direction control

  • ilchynac May 15, 2009

    heater will work proper if not touched after starting but if i turn up heat somtimes will not go down (all fuses are ok)

  • yadayada
    yadayada May 11, 2010

    sometimes don't turn down? what does this mean?

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The problem is in the heater control module. That is the control panel in the dash.Sorry it has to be replaced to correct the problem.

Posted on Jun 17, 2009

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Try replacing the blower motor resitor

http://www.buywiring.com/products/2-7-wire-blower-motor-resistor-harness-with-12-pigtail?template_id=2&image_id=7

in the picture it is the part with the white sticker

It is in the duct work under the passenger side dash.

I got mine locally for under $50

Posted on May 06, 2009

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