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Old 08-07-2006, 03:00 PM
Registered User
Join Date: Apr 2006
Location: North central Missouri
Posts: 34
Continuing vacuum woes

I pulled the drivers side door panel off this morning. I carefully eased the lines off and checked the vacuum, no vac on the yellow/green line.

The only other thing I did while I was in there I tightened the screw to snug up the outside door handle. Put it all back together..........and now the blasted lock won't work, can't lock it with the key, or push it down manually.

I don't see any loose or broken parts neither can I see, or feel, any reason for this latest glitch, is there anything obvious Iím missing? Any ideas or suggestions will be appreciated.

We really like this car, but itís driving me nuts with this continual string of annoying malfunctions.

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Old 08-08-2006, 10:25 AM
Join Date: Dec 2005
Location: CA... No. of S.F.
Posts: 890
For some dealing with vacuum issues is abstract...

and I too find them a challenge, but with a little reason, logic, patience and throw in some experience for good measure, they are really not that big a thing.

Originally Posted by mofarmer View Post
I carefully eased the lines off and checked the vacuum, no vac on the yellow/green line... checked the vacuum, no vac on the yellow/green line.
Where you say " Eased the lines off..." eased off what ?... the " master vacuum switch " that your door key turns ?

[ Q1 ] - Do you have a hand vacuum pump with gage or just a gage?

The door part functions like this:
(a) The vacuum source is first brought from the engine compartment to this door via a solid yellow vacuum supply line and it goes to the master vacuum switch [center connection I think].

(b) The master vacuum switch either ports the vacuum to the yel/grn [LOCK] function line throughout the car OR to the yel/red UNLOCK lines.

So you should first check to see if you are receiving vacuum on the solid yellow line... and then go downstream out into the plumbing system in the car. It is often easier to disconnect and check only small sections of the vacuum lines at one time... using caps as necessary and of course a hand vacuum pump.

Contact me by via PM E-mail and I will send you my recently drawn ~100K MS Word Door interLOCK diagram.
See: W123 Vacuum InterLock Diagram

It might not be exactly the same as your YR/Model car's [ that we do NOT know yet] but I think it's vivid colors will help you understand how the SYSTEM functions ! I'm still revising the diagram and hope to add a 1-page supplement for diagnostics and repair techniques.

For the most part you can think of a vacuum just as you do compressed air... except keep in mind the actual direction of flow of the air is opposite.

Best regards,
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Old 08-08-2006, 11:04 AM
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Join Date: Sep 2004
Posts: 8,731
Originally Posted by mofarmer View Post
is there anything obvious Iím missing? Any ideas or suggestions will be appreciated.
Specifying the model and year of the vehicle would be helpful.

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