C55 Duo Valve Location?
Thread Starter
Junior Member
Joined: Jun 2010
Posts: 24
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From: Charleston SC
C55 AMG
C55 Duo Valve Location?
I am new to the world of MB's and recently picked up a C55. The one thing that is an issue though is the Duo Valve. After reading a few threads about it I think I either need a new one or rebuild the current one. My question is where in the engine bay is it?
Thread Starter
Junior Member
Joined: Jun 2010
Posts: 24
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From: Charleston SC
C55 AMG
From everything that i have read it is the reason why i am getting luke warm air out of the drivers side vents and nice cool air from the passenger vents. I have tried to reset the AC with holding down the two buttons but that did not fix the issue.
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From: GA
2016 Chevrolet SS, 2006 Cadillac STS-V
I'm confused as well. Are you talking about the actuator for the temperature valves (doors)? That would be inside the car under the dash. However, are you sure the car is full on refrigerant and doesn't have a leak somewhere? I worked on a Cadillac that had a leaking condensor so it was getting low on refrigerant and the entire evaporator core wasn't getting cold. It just happened to be the side that sent air to the left side so the right side wasn't as cold.
Thread Starter
Junior Member
Joined: Jun 2010
Posts: 24
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From: Charleston SC
C55 AMG
No I am not sure. I assumed that since the passenger side was blowing nice and cold that it had something to do with the way it kept the temps different per side. I am going to check that this weekend.
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Joined: Feb 2009
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From: Cave Creek, AZ
2012 Mercedes S63 P30, 2015 Mercedes GL550, 2009 BMW 650i Convertible
My '05 C55 is exhibiting this same symptom. Before I take it in to have the refrigerant level checked, I'd like to tap on the duo valve. Does anyone know where it's located on a C55? (Thread search revealed nothing C55-specific, and I can't find it under the hood.)
Bill
Bill
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Member
Joined: Feb 2009
Posts: 180
Likes: 13
From: Cave Creek, AZ
2012 Mercedes S63 P30, 2015 Mercedes GL550, 2009 BMW 650i Convertible
Just wanted to give an update for future searchers on this subject. I took it to an independent shop, and they said the compressor had a very tiny leak. Rather than spend the $1,800 they wanted to replace the whole system, I just had them fill it up, as it was down to 0.9 lb. from the 1.9 lb. contained at full capacity. Blows cold, both sides cooling equally, and let's just hope it takes me through the AZ summer (116* today!).
Bill
Bill
