What do I hear starting & stopping in my car? - Mercedes-Benz Forum

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post #1 of 2 (permalink) Old 11-14-2007, 10:08 AM Thread Starter
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What do I hear starting & stopping in my car?

I hear what sounds like an electric pump/motor starting and stopping in approximately 3 and 4 second intervals in my 1993 400SEL. The sound comes from the right rear side of the car as I'm driving. Any ideas what it could be?
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post #2 of 2 (permalink) Old 11-14-2007, 02:26 PM
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There is a vacuum pump toward the left rear, and another one under the rear seat.

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