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There's a sensor in the duct work behind th glove box under the dash that controls the fan speeds.

It could be that. On my truck I only had the two highest speeds and that's the part I changed.

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โˆ™ 2009-12-08 15:20:30
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Q: If its not the fuse Why did your heater fan on your 95 GMC Sierra 2500 stop working completely?
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