I have a 300SD, 82, and its door locks work most of the time. Here are the symptoms:

Say I open the door,
- The pump runs
- The locks stay down
- I pull on the locks, they are hard to pull up and slam back down as soon as I let go.
- I open and close the drivers side lock with the key a few more times, each time I do, I can see the locks jerk downward.

From these symptoms I suspect the pump is working well and the system is holding enough vacuum to pull the locks down with a quickness. I figure there is maybe a switching valve in the driver's door? Unfortunately, I don't understand the system well at this point and am hoping someone can elighten me.

I have a vacuum pump, gauge, etc... from all the vacuum issues with my old 123


Frank.

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'82 300SD

hehehehehehehe, the evil system finally struck someone else. Mine malfunctioned around october, and it's still nto fixed!!!! mine stopped working all together, untill i would unplug the pump and plug it back in, then the pump would run untill it timed out everytime i turned the key, UNLESS I manually pushed down a vacuum powered lock, then it would switch dirrections, lock everythign, and then unlock everything again. I've written it off to a bad pump, maybe this summer i'll look into it again. Good luck figuring out the wiring, i still can't figure it out, theres a ton of vacuum switches etc inside the actual pump. If you find anything out please let me know, sorry i couldn't be of any help!
Ryan

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83 300SD.......sold
96 integra SE....sold
99 a4 quattro....sold
2001 IS300.......sold
2002 330i.........current.
2004 highlander limited....current.

before i get slammed for no periods, commas, bad spelling, typos etc, let me first state that it is 1:00AM here now. With that said, slam away...
Ryan

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83 300SD.......sold
96 integra SE....sold
99 a4 quattro....sold
2001 IS300.......sold
2002 330i.........current.
2004 highlander limited....current.

Frank,
When I purchased my 82 SD 3 years ago I had the same problem with an intermittent door lock operation. I tested the pump with a vacuum/pressure guage, it was fine. I used a "golf tee" to isolate each of the doors at the manifold under the passenger seat. I plugged the trunk and fuel door actuator first, they were working fine. I was able to pinpoint the problem to the passenger front door. The diaphram inside the actuator had a slight tear that would allow the vacuum and or pressure to escape. I left the tee in the manifold for the passenger door until I had a chance to replace the actuator. I hope this helps.

Tom

82 SD
86 SDL

Thanks Tom. My girlfriend says she heard a hissing in the passenger front door. I'm going to look there first. Good info.

Frank.

__________________
'82 300SD

Tom, I looked under the passenger seat but all I saw were motors, etc.. nothing that looked pneumatic. Maybe I didn't look hard enough but could you describe it to me.

I was able to confirm the hissing from the passenger front door when the lock was in the up position. I went away when I pushed it down. While fiddling with the locks trying to get them to come up, all but the driver's were "holding" themselves down, I was pulling on the rear drivers and all of them just came right up.

Just to increase my understanding, I'm assuming there is a switching mechanism in the driver's front door right? Some how this must tell the pump to come on and also redirect the vacuum? Or does it tell the pump to go the other way? Or is the vacuum switched on the pump?

If I can locate that manifold and do some vacuum testing, that would give me great confidence choosing that parts to replace.

Thanks for the help!

Frank.

__________________
'82 300SD

Check my reply to the other thread posted by Ryan(RG5384).

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BJ

09 GL320 Bluetec 65K+
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07 Kawasaki Vulcan 900 5k+ gone
87 300SDL 158k+ gone
91 300D 113k+ gone
83 300SD 220K+ gone
89 300E sold
87 190E sold
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Frank,
Like the_good_fellow stated in his reply to Ryan, it is located under the floormat.

Tom