there is a couple of things that can be wrong. it could be the PSE pump, a rod or an actuator. my driver door use to do that and mine was a bad actuator and rod. its not that expensive to fix but the hard part is getting the door opened with out damaging it. if i were you i would go to shop and have them make sure what exactly is wrong with it

forgot to mention rods are very hard to find. dealers sell wrong rods.

 

if your other doors locks are working, wouldnt that rule out the PSE pump? Or has the pump have a tendency to work on selected doors?

 

it all depends on your luck. forgot to mention is could be the hose. when you lock and un lock and you hear air near that door then it narrows it down to rode and or actuator

 

Thanks for the advise, I did notice that the door in question does unlock very slowly most of the time; however; I don't here any air leaks even after taking the pump out of it's compartment.

any other ideas will be greatly appreciated.

 

which pump did you take out? because this one is not controlled by the close assist pump. go near the door that doesnt work and near the knob area put your ear and look and unlock the door if you hear anything then you have air it will narrow it down to the actuator or rod

 

Yes, you are right nhzruthless818 and Sensei. I took the pump right from the left side inside the trunk.

Is there another pump anywhere else, or anything that triggers the door handle (inside and/or outside) when I try to open the door even after is unlocked.

thanks guys

 

yes there is another pump i cant remember exactly where it was but i think its suppose to be under the rear seat.

 

The pump you are looking for is under the back seat, passenger side.
There are two bolts at the lower edge of the seat just above the floor boards that need to be removed to get the seat out.

 

Perfect! I will get the seat out and get to this other pump.

I will update you napaAl and nhzruthless818 tomorrow with the outcome.

thanks again guys..

 

Why all of the interest in the pump?? If you pull up manually on the door lock stem and the door will not open the problem is inside the door and has nothing to do with the pump or vacuum actuators. They just operate the existing, pretty much standard door lock mechanism. If you are seeing the stem raise/lower slowly when operated by the pump you may have an issue with the pump/hoses/vacuum actuator but it will not prevent the door from being unlocked manually. Your problem is inside the door.

 

if my memory serves me correctly, you couldnt pull the door lock stem. you had to pull on the door handle once to unlock the door, and another time to actually open the door.

 

My guess is that you have a mechanical failure at the mechanism.

I make it a policy to lubricate all of the many mechanisms in these barges. If you end up removing your door panel, lube EVERYTHING. Then maybe if luck holds out, you won't have to change the window regulator next week.

 

thanks Sensei and chuckindetroit, You're both correct about the problem as I had mentioned on my first post. I manually lifted the stem and door still did not open.
The door stem will no longer raise/lower anymore when I tried it last night, however; it may be an internal issue like chuckindetroit mentioned.
How do I go about it though, if it's a mechanical problem on the latch not allowing me to open the door?

any input on this is always appreciated,

 

I dont know much but from what chuckindetroit and Sensei are suggesting, you are also correct NaaPal.
Any ideas to get this door to unlatch are always appreciated.

 

I have had an intermittent problem with one door like this during the winter. Sometimes striking the door firmly with my palms (pushing the door closed) near the latch would free things up.

 

thanks Detroit, I will try this, hopefully it works.

 

Hi mys320
i had a problem with my rear door on my s320 1996 this was about 18 months ago and fixed the problem i have just dug this reply out of the forum it helped some other members and could help you. This is if your door will not open from inside or outside the handles are Not jammed/stuck. Please try answer below good luck.

sid




I have had exactly the same problem for the last 5 months, door will not open from inside or outside so cant take door panel of just going around in circles. Getting in and out of car just useing one rear door but yesterday had some time of and had another go. YES i have FIXED this problem i was so fed up that i did not care if i broke the door panel i just wanted the door to open. So what i did was put glass fully down open usual screws 1 behind wooden piece 2 screws on handle then get 2 x flat screwdrivers with the glass down and if you look from top you will see the top of the door panel fold down between the glass rubber seal if you put screwdrivers in this small gap and lift up the lip which folds down next to the rubber seal it is pretty fiddley but keep at it. Once you have liffted enough to put other screwdriver underneath the small gap then you can go along the whole of the top of the door and pull the door panel up first & inwards please note the panel is very stiff so you will have to use some force. Now there is a small gap and you will be able to see behind the door panel but i could not get my arm in the gap i got angry and pulled the door panel inwards really hard and to my amasment the plastic door poppets behind the panel came away from the centre piller side.( I Just remembered i took the rear seat out first), so now all the panel came off except the side with the lock as the screw cannot be opened without opening the door.
I had already taken the panel of the oposite door to see how the lock worked. After inspection i could not see any plastic links broken and every thing seemed to be working right, it was still very tight to get ur hands near the lock as the door was still closed. So i got a long flat screw driver and pocked around in the locking mecanism pulling the out side door handle at the same time and suddenly the door opened i could not beleive it. So after long inspection nothing was broke so i sprayed plenty of WD40 on the lock ond it is working perfectly. I left the panel off over night just in case it decides to jam again but perfect, still do not know why the door was closed solid the only thing i think it could be is something was just stuck and i got lucky with pocking the screwdriver around. I hope this helps regards sid

 

Thanks Sid, I tried hitting the door with the palm of my hand and rubber mallet but did not do the trick. I will try these steps with the screw drivers, etc...

wish me luck guys!

 

I put my money on the problem being mechanical, with the actual lock mechanism..

Neither of the pumps could cause this problem..

That last post seemed quite helpful in terms of removing the door panel while the door is closed.. Good luck

 

My320, wouldn't it be helpful to remove the rear seat bench? Also, miniature, curved blade plastic pry bars are typical for trim removal (Harbor Freight). WD-40 is great for many things, but NOT long term lubrication. Good luck.

 

Thanks mafiaDON and napaAl,

I think sid hit the nail on the head. I removed the panel from the working rear door (right side) to get a better idea on what to look for. I found a small hole righ by the triangular window railing for the panel clips on to, and was able to insert a bendable 1/8" rod to get this door to open and it did without the assistance of either handles.
I then tried opened the door panel from the other door in question just enough to get a three inch gap, and fiddled with that rod, but could not get it opened before I realized I had to head to work. The saga continues tomorrow...

Thank you all!

 

Due to bad weather, I will have to wait on this project..

I have my garage full of stuff and can't drive the car in.

 

Good News Gentlemen!

I finally got this door opened. It turned out to be the part #71 from first diagram posted by Merc600sec. See below lin

http://www.benzworld.org/forums/w140-s-class/1564319-w140-ds-rear-door-stuck.html

Although I had to force the door panel to open more, giving me a bigger gap and access to notive the broken rod tha triggers the lock/unlock actuator.

Hope this helps anyone else with this similar issue.

Thanks to everyone!

Cheers!:bowdown: