Question about 2004 Chevrolet TrailBlazer
Nothing dangerous; using the defrost mode in most vehicles turns on the AC compressor to effect the drying out/removal of moisture. The compressor represents an additional burden on the engine which can bog down the idle speed so there is a compensator that should normally just prevent the engine idle speed from falling. Yours is just overcompensating and this may not be adjustable.
Posted on Apr 05, 2011
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Posted on Jan 02, 2017
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