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Posted on Jan 06, 2010
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2004 GMC Sierra 4dr truck. the fan does not work

2004 GMC Sierra 4dr truck. the fan does not work on setting 5. it does work on all other settings

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Harvey N Tawatao

Harvey N Tawatao

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  • GMC Master 3,854 Answers
  • Posted on Jan 06, 2010
Harvey N Tawatao
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The switch or the wire harness at the blower motor has gone bad. The highest setting 5 has no resistor, so the blower runs on high but the high current flow ends up burning up the switch's contact on that setting or the resistor wire harness at the blower motor has gone bad. Common would be the switch it self, if the switch is good. Then it's going to be the wire leads at the speed resistor by the blower motor under the glove box by the passenger leg compartment. Keep me posted, be glad to help you get your Sierra running 100% again soon.

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