Hi Guys,

C280 1994

Well it looks like there is only heat blowing out of the driver side vents. The passenger side vents blow cold air when the heat is on.

The cabin still heats up, but the passenger gets a little cool unless you close those vents.

any ideas? clogged heat exchanger? are there two blowers, one for each side?

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1977 280 E
1994 C280
1992 190E (sold)

"Jump in the hatch and turn on the key, pop in the clutch and let the wheels roll free"

The duo-valve was the culprit in mine. There are actually 2 sides to the heater core and 2 independent valves within the one valve block. You really should have the climate control codes checked by the dealer to pinpoint.