Re: Mercedes C class 1993 1800cc heater stuck hot Archived Message
Posted by andyhyoung on July 3, 2008, 7:49 am, in reply to "Mercedes C class 1993 1800cc heater stuck hot"
The heater duo valve is common failing on these but the control panels also give problems on these early cars.Check for battery volts to centre pin of duo valve and a fluctuating earth return signal on the outer pins (for left and right hot/cold)depending on where the heater control temp wheels are set.Otherwise its 2 spark plugs and 2 hose clips!!
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