Hi all,

First time posting here.  I have a quirky door lock problem on my 1980
240D.

- Vacuum system seems to work.  I can lock and unlock all of the door
from the *inside* by pushing down/pulling up on the driver's side lock
button.

-The driver's side does not lock or unlock with the key.

-The passenger's side will not lock with the key but *will* unlock
with the key.  This doesn't do me much good, since I can't lock the
doors with the doors open and leaving a window open doesn't do me much
good, obviously.

- The trunk locks and unlocks with the key.

I'd thought that the door handle's lock cylinders may be worn out or
corroded so I pulled the door handle assembly off the passenger side.
The key moves the lock tumbler freely when it's pulled from the door.
I tried to lock the door using a screwdriver inserted into the lock
mechanism's "reciever" (for lack of a better word) inside the door
frame.  No good.

Any insight?  Possibly the lock mechanism may "think" the door is open
when I try to turn the key?  I'm stumped as to why the lock button
would work but not the lock cylinder.

Thanks,
BG