The car is a 95 S320, there is no cold A/C from the left vent (driver side and the two left center vents). Instead, it would blow only hot heated air even the control is set to low. It would only work (blow cold A/C) when the cold air control is pushed on the center vent.

Thank you in advance, Jack

i have the same trouble. Any body?

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93 Toyota Corolla 177K
95 S 500 coupe 82K
92 400E 180K (SOLD)
94 E 420 150, blown gaskets (SOLD)
http://www.kanio.net/mercedes_signature.jpg

Sounds like your duovalve is in need of a re-build or replacement. They go all the way hot when they fail.

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"It's not about how fast you can go, but how well you can go fast."

Bob in Richmond

'97 S320 (LWB), Ruby Red Metallic, 73k miles
'97 S420V, Smoke Silver Metallic, 155k miles

When mine failed, it went cold on the one side... Couldn't get heat to the passenger side. Replaced it, and all was well...
Do the doors for the air handler box in the dash open and close properly?? When you change your airflow fully to the floor, does air still come out the side vent when the fan is on?? (best tested with the fan on max)

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All it takes for evil to prevail is for good men to stand by and do nothing.

Too many people tip toe through life, never attempting or doing anything great, hoping to make it safely to death... Bob Proctor

'95 S320 LWB
'87 300SDL
'04 E500 wagon 4matic