Hi All
I recently purchased a used c300 cab for my daughter and during the test drive I did not notice it, it's not so bad but wondering if anyone has an idea for a fix.

Everytime I get into the car either side, after the seat belt extender retracts fully, and I go over any slight bump there's a loud clunk. It only happens once, unless you get out and back in and do it all over again.

Second there's a slightly less clunk after the windows roll up (going over a bump), again only happening once. But I can trigger it anytime if I press the window up button even if the window is closed. The rear window closes pretty rough.

Thank you.

This sound like you are a bad car from something who didn't care about the car.