Humming sound - Mercedes-Benz Forum

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post #1 of 1 (permalink) Old 07-31-2011, 05:53 PM Thread Starter
BenzWorld Junior Member
Date registered: Jul 2011
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Humming sound

I have got mercedes c180 Kompressor Petrol

When i turn on the ignition to all the lights in the dashboard appear

a humming sound starts in the engine with ocassionaly slightly knocking sound....(only ignition is On, engine is off)

standing infront of the car - sound comes from the right a box with all metallic small pipes going in it

whats is this sound:?
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