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MB E320 2002 AC Blows warm air from Drivers Side

29766 Views 40 Replies 16 Participants Last post by  tony1963tony
I have a 2002 E320 and it has 10,755 miles on the odometer. I don't drive the car too often. I decided to drive the car today and turned the air-conditioning on and put in on automatic climate control. Just noticed that the air is blowing out cold from the passenger side vents but blowing out warn from Driver’s side vents. I even tried the Manuel mode instead of climate control. Any one knows about this solution or problem. I purchased the car brand new in December 2002 and also purchased a full 8 years extended warranty. But now all the warranties are expired and the vehicle has only 10, 755 miles and still smells and looks like a brand new automobile. The battery is still the original and gives no problem.

Any suggestions why it is blowing warm air from Drivers side vents when the air is on and the temperature set and 65 F


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If one side is ice cold and one side is warm, most likely is a sticky duovalve. Enter diagnose mode and post values. Just a tip, if one side sticks open and warm air blows one side, press front windscreen defrost for 5-10 seconds and release after. This might help to move plunger inside duovalve all the way and then to return to normal.
There is no significant difference left-right so unlikely to be related with a sticky plunger. So leave duovalve for now.
Looks like you are low on refrigerant and actually both sides are blowing luke-warm air.
For proper function of air conditioning evaporator temp should be at 37 degrees F.
Evac, vacuum test and fill to specs if no leak.
Initially thread was about one side cold, one side warm. Sensor readings show both sides warm with insufficient cooling in evaporator. Things are quite clear, the man needs a refill.
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