With 25 year old rubber vacuum diaphragms in the passenger door, trunk lock & gas flap...start by replacing ALL 3 of them!

BUT first make sure that the vacuum check valve under the hood HOLDS vacuum & also the vacuum storage tank under the fender.

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MERCEDES Benz Master Guild Technician (6 TIMES)
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190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
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