|
The gentle thumping...?
My 1995 C36 did it.
My 1998 C230 does it.
Dad's 1998 C230 does it.
My neighbour's 1998 C280 does it.
My car has done it since new.
The noise you hear is normal, but I would have the additional running of the vacuum pump checked. I've seen some leaks associated with the rear-head-rest release feature on the C-Class and the W210 E-Class.
|