| Duo
two valve system that allows the flow of engine coolant into the climate control system that on these model mercedes is a shared system both hot and cool are always avail on demand as the system calls for them with the climate control.
Bad valve or stuck valve and your a/c could be on and have it blowing hot air on one side and cold air on the other or depending where the valve is stuck someplace between the two extremes.Sometimes a whack with a screw driver handle will free them up,just don't whack to hard. |