OK, I didnt start this thread, but Im going to piggyback onto it... I got a mityvac, and now would appreciate a bit of walkthrough in checking the locking system... My car will start and stop, shift, and lock/unlock fine when on or immediately after turnoff. However, wait more than 30 seconds, and I have next to no vacuum. Plus, lately if I dont lock my doors, the car will have trouble shutting off if I dont do a high rpm highway run. Around town is bad in that regard. Every once in a while my fuel filler door doesnt lock with everything else, so thats the first culprit. But Id like to know where to start looking. Is there some main connector that all the doors feed off of? Where is the location that will allow me to check all the lock actuators and their feed lines from?
Many thanks,

JMH

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Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (116k)
1991 350SD (206k)
1991 300D (228k)
2008 ML320 CDI (199k)
1996 Dodge Ram CTD (442k)
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Past Diesels:
1983 300D (228K), 1985 300D (233K), 1993 300D 2.5T (338k), 1993 300SD (291k)