Question about 1998 GMC Sierra

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1998 gmc 2500 heater swith only work on high - 1998 GMC Sierra

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  • hackbl May 03, 2009

    the fan switch will only work on high

  • ccn7 May 11, 2010

    Are you talking about the heater blower motor switch? Or the temp. control switch?

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  • 16 Answers

Most likely cause is the blower motor resistor. If you remove the glove box (4 screws, two on each side), the resistor is located behind the 4 relays. Two screws hold it in place. rmeove screws and pull it up and out of the HVAC case.

Posted on Jul 27, 2009

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