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Q: sir,new compreesor fix new reciver drier fix cooling is front and rear is ok.but on 2003 Mercedes-Benz S500 4MATIC

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
when i start blower then compressor is on.and ac switch(on off)is off.what reasons.pls help me.
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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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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