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240D door lock/vacuum issue
After working on my 240D, i.e. oil change, motor mounts and steering shock, I find that my left rear door will not unlock. When something "breaks" after I just worked on the car, I try to retrace my steps to find out what I screwed up. I'm not so sure though that I caused this one? All of the vacuum lines around the oil filter canister look okay. All of my other door locks work fine as does the trunk and fuel door lock. The left rear door remains locked no matter what, although the locking button does move a little when I lock/unlock the car. I cannot pull it up manually either to unlock the door. I would have thought that if I screwed up a vacuum line somewhere that I'd have more issues than just this one door lock. I've got a Miti-vac, so I can go through the testing procedure, but does it sound more like an issue within the door itself?
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The vacuum source for the drivers side rear door is on the floor right in front of the drivers seat. Lift the carpet and the black plastic channel next to the body. You will find 2 sets of yellow/red and yellow/green lines. One pair heads to the passenger side, one set goes to the left rear door.
ID the left rear door set and use your mityvac on those two lines. Yellow/red locks the door and yellow/green unlocks it. A working vacuum actuator pod holds vacuum in either location. |
I would go directly to the door and take the panel off and then check the pod. Testing the lines under the carpet is great for finding where the problem is but chances are its in that back door and its the pod.
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Got as far as walking up to the car and thinking about removing the door panel. Then it hit me that in order to remove the door panel, I need to open the door right? So assuming it is a linkage problem and my Mity-vac won't unlock the door, what are my options?
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So you cant open the door from either side?
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What happens when you pull up on the inside lock button? wont budge, or comes up easy but nothing opens? |
Got some news, some good, some questionable.
So I decided to fiddle with that rear door today. Lock button goes up/down as it it supposed to when I lock the car using the driver's door lock button. Door would not open from the outside. I didn't think it would open from the inside either, but today I climbed in the backseat and gave it another try. There was some pretty strong resistance on the inside door handle and as I pulled on it, I also pushed against the door and it popped open. So now that door will open from either the inside or outside easily whether the doors are locked or not. Even when the lock button on that door is down, the door is not locked. The button however does go up/down as it should when locking the car. So do you think this points to a vacuum or a linkage issue? The door panel has not been removed yet, but at least now I can do that since the door opens. |
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Oddly, I am having the exact same problem while working on a 1987 300d. Rear DS door stuck locked with no way to open to remove the panel. Are the lines for this car in the same place?
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I dont know about the 87, but just pull the carpet up where I described and have a look. I would guess "yes".
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Those of you who guessed that the linkage was the issue, give yourself a gold star. Took the door panel off today and found that the linkage had slipped out of the plastic clip that the lock works. It looks like a piece of it broke off. It looks to me like it will easily happen again unless I change the part. It is part #003 988 50 78. Hard to tell from the EPC how big that slit in the side of it is supposed to be. Anyone know?
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