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  #1  
Old 04-30-2012, 10:25 AM
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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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Len
'59 220S Cabriolet-SOLD and living happily in Malta
'83 240D 351,500 miles original owner-SOLD
'88 560SL 41,000 miles - totaled and parted out
https://sites.google.com/site/mercedesstuff/home
'99 E300 turbo 227,500 miles
'03 SLK320 40,000 miles - gave to my daughter
'14 Smart electric coupe 28,500 miles
'14 Smart electric cabriolet 28,500 miles
'15 Smart electric coupe 28,000 miles

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  #2  
Old 04-30-2012, 10:28 AM
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Quote:
Originally Posted by sokoloff View Post
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 View Post
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.
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  #3  
Old 04-30-2012, 01:27 PM
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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.
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  #4  
Old 04-30-2012, 02:08 PM
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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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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"
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  #5  
Old 05-16-2012, 05:17 PM
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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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Len
'59 220S Cabriolet-SOLD and living happily in Malta
'83 240D 351,500 miles original owner-SOLD
'88 560SL 41,000 miles - totaled and parted out
https://sites.google.com/site/mercedesstuff/home
'99 E300 turbo 227,500 miles
'03 SLK320 40,000 miles - gave to my daughter
'14 Smart electric coupe 28,500 miles
'14 Smart electric cabriolet 28,500 miles
'15 Smart electric coupe 28,000 miles

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  #6  
Old 05-16-2012, 10:55 PM
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So you cant open the door from either side?
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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"
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  #7  
Old 05-17-2012, 12:26 PM
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Quote:
Originally Posted by Stevo View Post
So you cant open the door from either side?
Correct - door will not open from inside or outside.
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Len
'59 220S Cabriolet-SOLD and living happily in Malta
'83 240D 351,500 miles original owner-SOLD
'88 560SL 41,000 miles - totaled and parted out
https://sites.google.com/site/mercedesstuff/home
'99 E300 turbo 227,500 miles
'03 SLK320 40,000 miles - gave to my daughter
'14 Smart electric coupe 28,500 miles
'14 Smart electric cabriolet 28,500 miles
'15 Smart electric coupe 28,000 miles

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  #8  
Old 05-17-2012, 01:32 PM
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Quote:
Originally Posted by sokoloff View Post
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?
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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"
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  #9  
Old 05-18-2012, 12:36 PM
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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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Len
'59 220S Cabriolet-SOLD and living happily in Malta
'83 240D 351,500 miles original owner-SOLD
'88 560SL 41,000 miles - totaled and parted out
https://sites.google.com/site/mercedesstuff/home
'99 E300 turbo 227,500 miles
'03 SLK320 40,000 miles - gave to my daughter
'14 Smart electric coupe 28,500 miles
'14 Smart electric cabriolet 28,500 miles
'15 Smart electric coupe 28,000 miles

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  #10  
Old 05-18-2012, 01:19 PM
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Quote:
Originally Posted by sokoloff View Post
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.
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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"
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  #11  
Old 05-18-2012, 01:22 PM
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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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  #12  
Old 05-18-2012, 04:45 PM
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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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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"
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  #13  
Old 05-18-2012, 05:18 PM
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Join Date: Aug 2005
Location: Oregon
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Quote:
Originally Posted by sokoloff View Post

...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.
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  #14  
Old 05-19-2012, 01:50 PM
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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?

See attached.
Attached Thumbnails
240D door lock/vacuum issue-240d-rear-door-002.jpg   240D door lock/vacuum issue-240d-rear-door-003.jpg  
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Len
'59 220S Cabriolet-SOLD and living happily in Malta
'83 240D 351,500 miles original owner-SOLD
'88 560SL 41,000 miles - totaled and parted out
https://sites.google.com/site/mercedesstuff/home
'99 E300 turbo 227,500 miles
'03 SLK320 40,000 miles - gave to my daughter
'14 Smart electric coupe 28,500 miles
'14 Smart electric cabriolet 28,500 miles
'15 Smart electric coupe 28,000 miles

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  #15  
Old 05-19-2012, 02:48 PM
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Quote:
Originally Posted by sokoloff View Post
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

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