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I recently had the blower fan, module (resistor), and connector replaced. The blower is only blowing at 90% on defrost and 82% on vent. The module was replaced 2 more times. All vents are working. The dash control is good. The car heats and cools. High and low work but not at full power. You can hear the fan blowing. I had a dealer and two mechanics look at it. Any ideas on what the issue is would be much appreciated
 

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Good Luck. I have a 2005 impala and all the voltages are correct but the fan will not work, I can hot wire it to the cigarette lighter and it works fine except it's always on high. I see Chevy has made no progress since then. It's one of the systems GM has made just good enough to last about 5 years then then can care less. Buy a Toyota is all I can offer as advice.
 
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