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the blower fan rheostat usually located in blower box is like a resistor that draws energy from the blower fan supply to slow it down and there is a high speed fan relay for the fastest speed. So your rheostat is not working

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โˆ™ 2009-07-20 15:58:55
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Q: What causes the blower on a 2001 Chevy Silverado to work on high but not on low?
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