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Originally Posted by DaveLance
The A/C compressor does not always run when the engine is running. It runs when the A/C is turned on (obviously) and when the defrost setting is used. It shouldn't run when you go to vent or floor setting.
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Thanks Dave. I was reading a thread from BlazerLT that also mentions that the AC compressor is used when the defroster is on. I've been driving with the defroster on all day, which definitely explains it.