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Moonroof wind noise

1104 Views 9 Replies 5 Participants Last post by  08CTSShine
This doesn't seem to qualify as an appearance or performance mod, so I hope this is the right place to post for help. My 08 CTS has an aftermarket moonroof that the prior owner had installed. It's a nice feature and all, but the wind noise at 45+mph is just not acceptable. It sounds like having a window that is slightly-open ('cracked') all the time. The roof has no leaks, and the seal seems to be in great condition. The glass seems thick enough, but I'm no expert in that regard. I've dealt with it until now, but I'm looking to finally fix the only thing that bothers me about my great car. Any ideas on how to quiet this noise down? Thanks!
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I agree with your last post...looking for some type of lexan deflector to mount in front.

Have you determined where the noise is specifically coming from, i.e., the front of the sunroof or the rear or sides? If not from the front, then the value of the deflector may be diminished.
When you say sounds like a window slightly 'cracked' open, are you talking like an inch or two, or ex: 1/10 inch. I'd think a seal issue would be like the latter and sound like a 'hiss' or 'whistle'. If it's more a low-frequency 'buffeting' sound could be aero. maybe the factory does a better job acoustically isolating the glass. Kind of a goofy idea, but maybe you could fabricate a test deflector (strip of thick cardboard with folded legs/supports at each end, tape) just to see if it makes any noticeable difference.
I appreciate your line of thought, but how will this pass any speed while driving (being cardboard)? The noise doesn't appear until 45 mph is reached. Good thought, I just don't think it will hold up at speed. Or maybe this, a thought that just came to while while typing. Use that same piece of cardboard and tape it over the front of the sunroof glass to see if a deflector would work. Or instead of that, just try some duct tape over various parts of the glass (just the front, just one side then the other, just the back...) to see if the leakage is taken car of. Just do parts of the glass to eliminate parts of the noise...keep thinking.
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