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W163 Air con and heating

Discussion in 'Electrics, Vacuum, Ignition and ECU' started by rony2rip, Dec 4, 2012.

  1. rony2rip

    rony2rip New Member

    Likes Received:
    Nov 18, 2012
    Co Down
    Your Mercedes:
    ML 270 cdi 2003
    Hi All
    Can anyone explain why the ventilation in my 2003 ML suddenly switches on from a quiet auto mode to a loud compressor type fan in the back of the car with no real difference in air or temperature. Then it will stop as quickly as it started. Very confusing.

    I would also be grateful if anyone can advise on the temp controls in the back, I've read the manual and even when the temperature is up high in the front there is no heat from the vents in the floor or centre unit

    Happy for any advice or direction anyone can give.....Thanks

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