Car Problem Reports

Mercedes-Benz C280 Control Flaps May Fail Due to Leaking Vacuum Manifold for Climate Control Actuator

Mercedes-Benz C280 Problem
19 Reports
Me Too

Model Years Affected: 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2007

Average Mileage: 119,910 mi (60,000 mi - 175,000 mi)


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.

  •  Rookie

    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.

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  • passenger side vents suddenly start blowing cold air when heat is on. Driver side vents still blow hot air.

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  • A/C blows fine, but blower is stuck in defrost mode, and won't blow out the regular vents.

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  • Visitor, , 148,376 mi

    had cracked vacuum block replaced but air only blows hot air

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  • Visitor, , 70,000 mi

    Poor operation of the air circulation and temperature when turn to the lowest or highest degree

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  • Visitor, , 154,000 mi


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  •  Rookie

    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).

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