PeachParts Mercedes-Benz Forum

PeachParts Mercedes-Benz Forum (http://www.peachparts.com/shopforum/)
-   Diesel Discussion (http://www.peachparts.com/shopforum/diesel-discussion/)
-   -   240D door lock/vacuum issue (http://www.peachparts.com/shopforum/diesel-discussion/317026-240d-door-lock-vacuum-issue.html)

sokoloff 04-30-2012 10:25 AM

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?

tangofox007 04-30-2012 10:28 AM

Quote:

Originally Posted by sokoloff (Post 2929026)
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.

Agreed.

Quote:

Originally Posted by sokoloff (Post 2929026)
I cannot pull it up manually either to unlock the door.

That sounds more like a linkage issue that a vacuum problem. I would be removing an interior door panel for a look.

TnBob 04-30-2012 01:27 PM

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.

Stevo 04-30-2012 02:08 PM

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.

sokoloff 05-16-2012 05:17 PM

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?

Stevo 05-16-2012 10:55 PM

So you cant open the door from either side?

sokoloff 05-17-2012 12:26 PM

Quote:

Originally Posted by Stevo (Post 2938591)
So you cant open the door from either side?

Correct - door will not open from inside or outside.

Stevo 05-17-2012 01:32 PM

Quote:

Originally Posted by sokoloff (Post 2938836)
Correct - door will not open from inside or outside.

Humm, You might try appealing vacuum to the lines found under the p/s side carpet next to the door. They are covered with a black plastic cover. One of those lines goes to the door you have the problem with. It wouldn't take long to put vacuum to each one of those lines and see if, when you hit the right one, that will unlock it. It could be strictly in the linkage but I would try the vacuum approach first. If that fails maybe a visit to your friendly locksmith, the guy you would call if you locked the keys in the car.

What happens when you pull up on the inside lock button? wont budge, or comes up easy but nothing opens?

sokoloff 05-18-2012 12:36 PM

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.

Stevo 05-18-2012 01:19 PM

Quote:

Originally Posted by sokoloff (Post 2939476)
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.

Do you have a Mity Vac (or the like)? Its pretty much a necessary tool if you plan to keep the car or do any basic work. Harbor Freight has them at a good price. When you remove the door panel, after checking the linkage, you can remove the vac. pod or maybe unplug the lines and check it in place using your lungs if need be.

hschickel 05-18-2012 01:22 PM

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?

Stevo 05-18-2012 04:45 PM

I dont know about the 87, but just pull the carpet up where I described and have a look. I would guess "yes".

Left Coast 05-18-2012 05:18 PM

Quote:

Originally Posted by sokoloff (Post 2939476)

...Lock button goes up/down as it it supposed to when I lock the car using the driver's door lock button.

...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?\

I think you are past the mity-vac stage in diagnosis. What you are saying indicates that either the lock linkage is broken or the lock itself is malfunctioning.

sokoloff 05-19-2012 01:50 PM

2 Attachment(s)
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?

See attached.

tangofox007 05-19-2012 02:48 PM

Quote:

Originally Posted by sokoloff (Post 2940150)
Those of you who guessed that the linkage was the issue, give yourself a gold star.

Guess - Definition and More from the Free Merriam-Webster Dictionary


All times are GMT -4. The time now is 04:27 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2025, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2024 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website