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Old 12-23-2003, 08:25 AM
mbdoc mbdoc is offline
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
The drivers door has a MASTER supply valve that distributes vacuum from the engine (& vacuum storage tank) to the right front door, trunk, & gas flap.
There is yellow/red lines to lock & yellow/green to unlock.

The source vacuum line is yellow. MOST common failure is the vacuum elements leaking(rubber diaphrams).
The elements have constant pressure OR vacuum so 30+ years and you will need new ones.
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