Report: Control Flaps May Fail Due to Leaking Vacuum Manifold for Climate Control Actuator
Mercedes-Benz C280 Problem
Average Mileage: 118,875 mi (60,000 mi - 154,000 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.
Visitor, 1999 Mercedes-Benz C280
passenger side vents suddenly start blowing cold air when heat is on. Driver side vents still blow hot air.
Center vents do not blow. I can change the controller settings to try to redirect but the air flow does not change. Blows out the two side dash vents and defrost only.
Visitor, 1995 Mercedes-Benz C280
A/C blows fine, but blower is stuck in defrost mode, and won't blow out the regular vents.
Visitor, 1996 Mercedes-Benz C280, 148,376 mi
had cracked vacuum block replaced but air only blows hot air
Visitor, 1995 Mercedes-Benz C280, 154,000 mi
STILL NOT WORKING
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).