My 1985 190D has developed the following:
Won't shut off
Won't switch from vent, to defrost, to fresh air....
Door locks work.
I replaced a section of tubing from the front of the engine (near the vacuum pump) to the firewall because it was cracked...no help. I know that section has something to do with the shutoff because if I suck on the tube (no jokes, please) while the engine is running, it will shut off. It won't shut off with the key. If I pull the new tube off and feel for vacuum, there sure isn't much. Does the pump on the front of the engine produce a lot of suction? Do they ever go bad? Does it have something to do with the vacuum switching mechanism behind the passenger vent?
Someone help me out, please......
Ken In STL