Knocking sound from roof?
03-08-2011, 11:50 PM
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'11 Mercedes Benz C300; Black on Black 7g-tronic, Nav+4 uni
Knocking sound from roof?
Hi everyone so I have 2011 c300 with 2500 miles on it now. And recently I have begun to hear a knock sound common from the roof of the car whenever I drive on a speed bump or up or down a driveway. It only happens sometimes and I don't know know why it is doing this. It happens with the sunroof shade open and closed. Does anyone else have this issue or am I just being ****? I'm not sure what it is and can't figure out where it is coming from. Thanks
03-09-2011, 08:14 AM
#2
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Not sure if it is the same thing but I had this issue with my CTS and the dealer had to adjust the tension on my sunroof - it was actually was popping open about a 1/4 inch and slamming back closed when going over a quick bump as you describe.
Do a quick check and see if you can push up (lightly) on the sunroof when it is n the closed position.
Do a quick check and see if you can push up (lightly) on the sunroof when it is n the closed position.
03-09-2011, 01:32 PM
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2012 C250 Coupe
Is it a knocking or a rattle? I used to have the rear dome light rattle under situations you describe. Brought it in and they fixed it. I believe they took it down and applied some felt.
03-10-2011, 02:40 AM
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'11 Mercedes Benz C300; Black on Black 7g-tronic, Nav+4 uni
Thanks guys. But I checked the sunroof and it moves up just a bit but it's nothing I can find that rattles. It may be the rear dome light. Today when I was driving it actually doesn't sound like a knock but more of a rattle but only does it once. It's a single click then it stops. It's nothing that continues to rattle but does it at least a few times when driving.....
03-10-2011, 05:14 AM
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W204 C280
I have the exact same problem on my car. I haven't been able to solve it yet and the dealer said the only way for them to check is it remove my ceiling. Something I wasn't willing to do just yet. They did find creaking sounds and popping sounds coming from my B pillar. They put foam in between where the ceiling meets the B pillar. It seemed to have helped. I also used get a lot of popping sounds coming from the black plastic cover between the door in the seal. Again, they put foam and some fillers and the sound only comes out when I drive over a steep driveway at an angle.
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03-11-2011, 12:41 PM
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'11 Mercedes Benz C300; Black on Black 7g-tronic, Nav+4 uni
I have the exact same problem on my car. I haven't been able to solve it yet and the dealer said the only way for them to check is it remove my ceiling. Something I wasn't willing to do just yet. They did find creaking sounds and popping sounds coming from my B pillar. They put foam in between where the ceiling meets the B pillar. It seemed to have helped. I also used get a lot of popping sounds coming from the black plastic cover between the door in the seal. Again, they put foam and some fillers and the sound only comes out when I drive over a steep driveway at an angle.
