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There's a vacuum pump for the door locks. It should shut off automatically as soon as vacuum is built in the lock system. Running for a full 30 seconds sounds like there's a leak somewhere and the pump is timing out. In W126 chassis the pump is in the spare tire well. Not sure on W124, it may be under the rear seat.
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Current stable:
1995 E320 157K (Nancy)
1983 500SL 125K (SLoL)
Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)
Gone and wanting to forget:
1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]
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