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  #1  
Old 09-09-2014, 04:28 PM
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Join Date: Sep 2014
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1989 300E Mercedes air conditioning problem

What is happening is hot air coming out of driver & passenger side ports, while cold air is coming out of the center ports. Could it be vacuum check valve for climate control. Any advise would be appreciated.
Thank you

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Old 09-09-2014, 10:15 PM
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Join Date: Feb 2007
Location: los angeles
Posts: 686
sounds like heater valve, mono or later duo-valve leaking , when not commanded , hot coolant maybe coming thru, to test pinch th heater valve hose and see if heat stops coming out sides , if it does , check for electrical operation , if that checks ok replace valve as rubber seal internally are probably torn
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Old 09-10-2014, 03:10 PM
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1989 300E Mercedes air conditioning problem

Thank you Nulu

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