Date registered: Apr 2007
Vehicle: 2001 SLK 320(215K Miles), 2002 E320 Special Edition(182K Miles)
Location: Texas Hill Country
Mentioned: 0 Post(s)
Quoted: 29 Post(s)
Yes, another AC thread.
But don't panic - I've taken all the readings, checked the error codes (no surprises, the normal sun sensor fault), etc.
Basically, the AC on the driver side sometimes only supply lukewarm air instead of cold air like the passenger side. Other times it cools perfectly. Refrigerant pressure (reading 07) varies between 10 and 16 depending on speed. All other readings seem to be normal. The interesting thing is that when the problem occurs, the left heater core temperature is always about 17 degrees higher then right core temperature, even if I set both sides to LO.
My feeling is that the duo valve for the left side is sticking or not closing properly. Any ideas on my diagnosis or any other way I can test my hypothesis before I disassemble the duo valve? I think that if I do disassemble the duo valve, I'll just order this from Amazon for $41.99 - "Heater Valve Repair Kit Compatible with Mercedes-Benz Cars - Set of Heater Repair Parts for Self-Repair - W210, W220, W124, W202". I think if I open it up, I may just as well replace all the rubbers, seals, poppet valves, etc while I have it open.
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Only two thing are infinite, the universe and human stupidity, and I'm not so sure about the former.
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