I am having the exact same problem on the passenger door of myb 97' S320. The reply to this thread helped me understand that this could just be a vacuum leak. Can anyone please tell me where in the car the closer pump is located so I can inspect that for leaks.

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KCScout
98 S420 My Wife's Baby
97 S320 My road car
83 300D My old road car (love that diesel)
81 300SD Wife's former Baby
81 240D A fun stick shifter
71 220D My first one