Road Noise
Thread Starter
Junior Member
Joined: May 2008
Posts: 47
Likes: 2
From: Alexandria, VA
'17 C300 Sport, P2, Pano, Black; '17 Jetta GLI White
Road Noise
Finally got my c300 Sport last week and it drives great. i will post pics of it soon. Took it on the highway the other day and noticed it sounds like a window is cracked open when driving. Definitely more noise than my other vehicles. All windows were up, doors were closed, sunroof was closed. Im going for a couple hundred mile drive tomorrow and will try to pinpoint it but most likely Im gonna have the dealer look at it. Any ideas? Is this normal? Just seemed like too much road noise to me especially since I don't remember the test drive being like this. It sounded like a window was not all the way up. Everything else is great. I love taking turns at 40 mph 
MBWorld Fanatic!
Joined: Oct 2007
Posts: 1,828
Likes: 1
From: United States
2008 R350 & 2008 C300
The big mirrors are most likely your problem, they tend to make a lot of noise if its windy outside. Other than that you might have a bad seal on one of the windows or doors, but I'd go with the mirrors first.
Thread Starter
Junior Member
Joined: May 2008
Posts: 47
Likes: 2
From: Alexandria, VA
'17 C300 Sport, P2, Pano, Black; '17 Jetta GLI White
I thought that might be the problem after reading everyones posts about the mirrors but it seemed like a door or window wasnt sealing correctly. Tomorrow I will see if it comes from one side of the car or both sides. If its both sides, most likely its the mirrors but it sounded like it was coming from the passenger side. Thanks again
Senior Member
Joined: Aug 2007
Posts: 446
Likes: 1
'08 C 300 Sport, '01 SL 500 & '08 Nissan Frontier SE Crew Cab 4WD
It's a known issue with the W204. I brought it up with my service advisor on our A-Service and he said MB knows about it but there isn't a TSB out for it yet. Our car has done the same since day one, happens at about 68-70 mph.
-Ryan
-Ryan
Thread Starter
Junior Member
Joined: May 2008
Posts: 47
Likes: 2
From: Alexandria, VA
'17 C300 Sport, P2, Pano, Black; '17 Jetta GLI White
If that the case, will they issue a fix?
MBWorld Fanatic!
Joined: Dec 2007
Posts: 1,007
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From: N. California
2008 Arctic White C300 Sport 6M
What the he77... I thought I was the only one. 
I kept thinkin to myself how this is one of the loudest cars (at highway speeds) I've ever ridden in, but people kept saying this is their quietest car ever... I thought it was just me.
Now I kno I'm not
I kept thinkin to myself how this is one of the loudest cars (at highway speeds) I've ever ridden in, but people kept saying this is their quietest car ever... I thought it was just me. Now I kno I'm not
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Super Member
Joined: Sep 2007
Posts: 978
Likes: 3
From: Essex County, NJ
2011 E350 Sport 4Matic - P2 & Drivers Assist / 2010 C300 Sport 4Matic - P2 / 2013 Porsche Cayenne S
Finally got my c300 Sport last week and it drives great. i will post pics of it soon. Took it on the highway the other day and noticed it sounds like a window is cracked open when driving. Definitely more noise than my other vehicles. All windows were up, doors were closed, sunroof was closed. Im going for a couple hundred mile drive tomorrow and will try to pinpoint it but most likely Im gonna have the dealer look at it. Any ideas? Is this normal? Just seemed like too much road noise to me especially since I don't remember the test drive being like this. It sounded like a window was not all the way up. Everything else is great. I love taking turns at 40 mph
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MBWorld Fanatic!
Joined: May 2008
Posts: 2,824
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From: Long Island, New York
2013 C300 Sport Black Darth V3.0
When I first picked it up I heard a wind whistle from the drivers rear door area. Wife and daughter couldn't hear it. When I brought the car in for the 1000 mile check up I told the SA about it when I picked up the car he told me they had to do a minor adjustment to the drivers side rear door no whistle now.
