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Sir,new compreesor fix new reciver drier fix cooling is front and rear is ok.but

(2003 Mercedes-Benz S500 4MATIC)
in Norfolk, VA on April 11, 2012
when i start blower then compressor is on.and ac switch(on off)is off.what reasons.pls help me.
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Popular Answer
of Carmasters Automotive on July 30, 2014
Most vehicles when set to any defroster position will also run the A/C compressor to help cool and condense moisture in the air before heating the air and blowing on your windshield (if air heated was not dry your windshield would fog up)
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