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Why does your 1999 Yukon heat only work on high?

Updated: 8/17/2019
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15y ago

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If you are referring to the blower motor only working on the high speed setting, then the problem is the blower motor Resistor Pack is defective. Replace it. It can be the blower motor speed control switch but not likely.

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15y ago
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Q: Why does your 1999 Yukon heat only work on high?
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