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Defrost with heater or using ac compressor??

pippo on Thu July 17, 2014 8:21 PM User is offline

People,

Wondering at about what year/when did cars started being engineered with the 'defrost" mode utilizing the ac compressor, actually producing COLD defrost temps top clear up that fogy windshield as opposed to older cars (1970s??) which never did this but instead defrost mode used warm/heated air. Anybody know? or am I misinformed in that they always used the COLD ac to defrost?

Thanks, people.

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