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Mercedes-Benz
C280
28

Incorrect Air Delivery and/or Temperature From Climate Control System on Mercedes-Benz C280

Problem Description and Possible Solution

The vacuum manifold for the climate control actuator may develop a leak, This can cause poor or no operation of the air delivery and temperature control flaps.

Problem Data
RepairPal Verified
Average mileage: 123,387 (57,890–244,000)
9 model years affected: 1994, 1995, 1996, 1997, more1998, 1999, 2000, 2006, 2007
28 people reported this problem
Comments
Viewing 1 - 9 of 9 comments
I had this problem last year. It was solved by reconnecting a vac line that was near the oil filter. The line was not immediately apparent but it drops down in the oil filter area to a connector which can inadvertently pulled loose during a filter change. When I found the line, I pulled slightly on it and it was apparent it was loose. I think I had to reconnect it from under the car. When reconnected, everything worked normally again.
Air does not flow from the center vents. MB dealer said it was the air-conditioning actuator, which needs to be replaced. They said it is a $600 to $800 repair at the dealership and could be fixed for much less at an independent shop (recommended that due to the car's age and value, especially since its not a critical safety system).
Heat does not come through the vents when commanded, only cold air (AC) then as the car drives for about 1/2 hour or 45 min then the heat slowly starts to work better till its almost normal.