When I pull my driver side lock pin from inside it doesn't open all the other locks. Instead I hear the vacuum pump churning away for about a minute.

If I use the key it closes and opens the door and all the doors with no problem from the drivers side.

If all the locks are open and I push my drivers side pin down it closes all the locks but I can hear the pump churning again for a minute after.

Where should I start looking.

Its a W124 260E 1988. Doh!

I checked the pump in the back but I can't see any loose connections. I'm going to get a vaccuum tester.

checkt he fuel door vacuum lock...

Mine was leaking so I capped it off temporarily

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'92 300CE - Sold
2004 C240 - 744 - C7 Wheels - Android Radio
2002 C320 - 816 - Sport Wagon

I'll take a look Ashman. You might be right, I don't think I hear the clunk from there anymore. Thanks for the response.

I had the same symptoms up until 2 days ago. In addition to erratic lock behavior, I could also hear a hissing of air in the trunk.
Turns out that a vacuum line needed a bit of rubber tubing. A 1 inch section had rubbed trough, or was possible eaten through by acid when my battery exploded a while back.

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It is a truism that almost any sect, cult, or religion will legislate its creed into law if it acquires the political power to do so. Robert A. Heinlein


09 Jetta TDI
1985 300D