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The defroster uses the A/C pump, turn off the defroster and the A/C won't cycle, but then foggy windows.
It does this to dehumidify the air being blown across the windshield to reduce the fog quicker.
Edit: if the defrost blower is off and the rear window defrost is off as well then the a/c shouldn't be turning on, that'd be a dealer question.
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Originally Posted by Guff
ineedyourdiddly
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