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I have the 4 climate control system on my S550. Recently I noticed the rear heat climate is blowing cold. Did a bunch of research and believe the culprit to be the rear heat control valve also known as the duo. I found the front heat one is located under the windshield wipers. However the rear is located under the passenger fender I believe. Does anyone has the WIS for this? Gonna try to tackle this Friday, so any DIY info would help.
Has anyone every had this issue? The front is find but the rear heater is only blowing cold air? Im trying to figure out where the rear heater control valve is located?
Found the part off eBay. Took off the passenger fender liner. The liner by the door side not by the front bumper side. Got the part off eBay for $75 and seems to be working find. Rear heater control valve. Thanks for the help hope
It helps someone else out.
02-17-2016, 05:17 PM
