Quote:
Originally posted by black 1994 c280
I have the same sound on my 94 C280. I was told that it was the vacuum pump
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it IS the vacuum pump which is used for the central locking, airconditioning system (operation of valves in the heater housing) and possible multi contour seats...
A humming sound every 2 minutes is too often and not that normal...but as long as the sound only continous for 2 seconds, I wouldn't pay too much attention to it.
greetingz,