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Old 05-24-2003, 11:32 PM
Registered User
Join Date: Dec 2000
Location: Mountain Island Lake, Charlotte NC
Posts: 376
duo valve?

I am having an issue with my w210. On a couple of occasions I have had my AC refuse to cool. The situation only lasts a few minutes and then cools great! Today, the other extreme..I tried to turn the heat on..and it wouldn't heat. I turned the climate control to 80 and it was blowing 52degree air. If I pressed the EC botton it would only send outdoor air in the car.

Is this a duo valve(?) problem?
Rob Armstrong, Charlotte, NC
Mountain Island Lake

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Old 05-25-2003, 04:25 PM
Senior Member
Join Date: Sep 2002
Location: New Jersey, U.S.A.
Posts: 2,398
Evaporator temperature sensors are a common problem. I'd start there.
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Old 05-25-2003, 04:59 PM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
Through the control head you can see the actual values of all the sensors. My A/C article gives the technique and data positions. If you go to the car after it has sat for 24 hours all the sensors should have the same value. This is a quick indicator.
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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