I just bought a 1979 240D, and have a question about the door locks. I've been reading on the forum, many threads, but can't really understand, I guess? Are my door locks controlled by vacuum? IF this is correct, if I lock the drivers side door, with the key, are all the other doors supposed to lock? If this is correct, how long after the motor is shut off, does this still work? I havent tried locking my drivers door with the key, but I know, with all the doors unlocked. When I shut the motor off and leave, when I come back the passenger side door is locked, so I assume this is some type of vacuum problem. If so, where do I look for the culprit, and how do I go about fixing it?
thanks,
Jim