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Old 07-08-2000, 05:29 PM
Posts: n/a
Can enyone tell me what is the best way to troubleshoot a problem where the doors on a 1992 300SE some times close with the vacume system when they are ajar and some times they do not?
Thank you.


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Old 07-08-2000, 06:52 PM
JCE's Avatar
JCE JCE is offline
Down to the Wear Bars
Join Date: May 1999
Location: So Kalifornia
Posts: 2,189
There was a discussion on this some time ago - use the search button for the topic "93 300SE Automatic door/trunk close???". The consensus seemed to involve removing 2 fuses in the trunk for a while. Hope this helps.

87 300E, 65k miles
Smoke Silver
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Old 07-08-2000, 08:11 PM
Van Helden
Posts: n/a
I'am having the same problem on the same model at 65K. My trunk pulldown is also out of commission. This is the second time in 8 mo. and they have a new pump on order for this. They now suspect this problem may also be related to the door (drivers side). However, the other doors close properly. I should know for sure in a week and will let you know. aAs an aside, thhis car is full of electrical problems not to mention a new head gasket. Thank goodness for the extended warranty. I couldn't afford it otherwise. The 100 mile trips to the dealer are getting tiring. Otherwise a great car!
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Old 07-08-2000, 08:53 PM
Senior Member
Join Date: Apr 1999
Location: Walnut,CA,USA
Posts: 554
The closing assist pump is alway the ploblem because pump work so hard in closing system it just have short life.

MB STARS Master Guild Technician,12 years MB tech
6 years independent shop owner
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Old 07-08-2000, 10:46 PM
Posts: n/a
I just want to say thank you everyone I will
look at the components.
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Old 07-09-2000, 12:29 AM
akry's Avatar
W140 Maniac
Join Date: May 1999
Location: Burnaby, BC, Canada
Posts: 960
I think MB updated the pump when W140 got its facelift in 1995. The newer pump is quieter when operating, and reacts alot faster then old one. Though it's not confirm, it's just my experience. At least, that's how it feels when compare mine to my GF's parent's 1995 S320.

Andy Kuo


  • 1992 Mercedes-Benz 400SE
  • Pearl Grey/Black Leather

Mercedes Owners ICQ ActiveList ID#61730549
Mercedes S-Class Page
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Old 07-12-2000, 10:07 PM
Van Helden
Posts: n/a
I got my new pump put in today and the trunk as well as the doors now work fine. I was also pleased to hear that these electrical parts are improved, according to the tech. who worked on it. Till the next time something fries.
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Old 07-14-2000, 06:48 PM
Registered User
Join Date: Apr 1999
Location: Cincinnati, OH, USA
Posts: 59
Hello Andy and all,
Did they change the part number for the new pump and do you know what it is? I took my pump apart in a 92 500SEL but there was not much I could do except make sure the manifold and valves were clean. I did notice that there is a good bit of heat generated when the pump is in action, and that is when the pump was out of the housing. Considering that it is in a plastic case which in turn is inside a foam housing, I wonder if it simply overheats.

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Old 07-14-2000, 07:52 PM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
When the system is operating correctly it should run for only 1-2 seconds. SOOOO if there is a leak in the system (pressure not vacuum) it will run too long & that is the only way it can get too hot!

27 YEARS DEALER M.B. Shopforeman
1986 190E 16V

[This message has been edited by M.B.DOC (edited 07-14-2000).]
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Old 03-06-2009, 01:55 AM
86560SEL's Avatar
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Join Date: Jan 2003
Location: east Tennessee (southeast USA)
Posts: 3,015
I didnt know that the 92' 300SE had power doors. My uncle has one and I never noticed it having them... was it optional?

WOW, a 9 year old post!
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Old 03-06-2009, 10:15 AM
Registered User
Join Date: Mar 2009
Location: Colorado
Posts: 9
I believe that 1992 was the first year for the W140 and they all have the Closing Aid. All the S class w140 and newer use closing Aid. I did another post just for this Closing Aid fix. I do not see it any more. Maybe it was moved . At any rate. This fix that I have for closing AID is a big break through for those annoying closing aid gremlins. My Father got rid of his S500 because of it. He wound up paying over 3000 dollars for pump and lines and door calibrations and on and on. Mercedes even flew some Engineers out from NYC to look at the car. After all that, He still had intermittent problems with his closing AID. He got so fed up he sold the car he loved or hated. He hated it.. He love it !! He hated it !! . He still loves that car and now that I have the fix, he is looking to buy another. It may sound strange to sell a car just because you have to slam the doors shut or reset the circuit when it happens.. But.. After almost 2 years of dealing with it after spending so much money to have it fixed.. Well.. He did... He got a letter from Mercedes saying it was fixed and with that letter he traded in the car for a Hemi that did not have closing AID doors. And now that I have a 400SEL and I let him drive it.. And the Doors work perfectly with my circuit. My Dad now wants to trade his 300c for my 400sel.. I may do it.. As long as he promised to trade back.. And.. I know he does not want to give the car back.. so.. Now he is looking for his own when he gets back home from Texas... He likes his Little Lexus LS430 and the 300C is fast.. But.. There is nothing like the Big S Class by Mercedes. And he wants one again now that there is a fix for the doors.. Yes !!!

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