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#1
05-23-2005, 09:57 AM
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W140 A/C Cool and Heat through Defrost Vents
It seems my Air-conditioning systems has developed a random occurrence of blowing heat through the defrost vents while blowing cold air through front dash vents. The new feature (AC/Heat condition) doesn’t occur consistently.
One other condition that has puzzled me regarding the A/C is when the engine is under load (going up a hill) the air flow will cease. Last, it seems the car has a noticeable “whining” noise when the A/C is operating. I’m unsure if all these condition are related, but if anyone else has had similar problem or can offer me insight into my problem – your help would greatly be appreciated! 92 400SE W140 Thanks in advance. Russell
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Russell McMahon Tulsa, OK 2001 CLK 320 1992 400se 1993 400e 2000 320ML 
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