hello all,
I have a 1991 300se that i have no air flow from center vents. i have tried a new push button control head and tested the switching valve. from what i have read on the switching valve is there in one power wire (black/red wire or black/pink), the other 7 wires to the switching valve are the grounds to each solenoid in the valve. when i add manual power to the valve and ground each solenoid i get theclicking noise. so i added vacuum to the valve and grounded each terminal and i get vacuum out of each one so im assuming the vavle is good. i thought control head was not working properly so installed a new control head and same problem. any insite into this would be greatly accepted.