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It is most likely the blower resistor pack that has failed. At Autozone it is part number DR755 and is located on the passengers side in the cab by the firewall
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Any suggestions as to why on my 2006 Chevy trailblazer AC Controls 1-4 work normal but setting 5 does not?
I had the same problem then the other ones went out. It was a relay switch located on the blower fan under the dash
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