My guess on the 02-06 models if there is ( excessive ) wind noise,.. something changed from when it was new and needs fixing.
Shouldn't be a problem, .. just my opinion.
But, Specificly on the 07 EXT's it's a different story.
Search previous posts on 07 wind noise.
There's about an hour of reading on multiple fixes, including GM Bulletins on what to do to fix it,...none of which work completely.
I spent 4 weeks working on mine, myself, and, bringing it to the dealer a few times.
Once they adjusted my front doors it helped, slightly more than a " little".
The back doors are already so far in.. from the Factory they can't be adjusted in any further but you can see they don't seal tight.
There is something wrong with the "design" of the vehicle the way the weather stripping is ( cheap or designed wrong and not sealing correctly) and the way the doors line up.
I went so far as to add 3/16" thick stick on weather stripping, sealing all my doors and back window,..to the point where the doors needed to be closed forcefully or they wouldn't close.
Still,.. Lots of wind noise.
The Avalanche Forum ( 07's ) if full of posts on the "Exact same problem" and nobody has had any success either.
I've yet to see a post or hear from someone that fixed the wind noise or had it fixed " successfully".
One of the members on this Forum, back in March, traded his 07 back in and got another 07 that was only 3 weeks old and it also had terrible wind noise.
Went back to the dealer and tried out 6 different New vehicles on the lot and they ALL had the same Exccessive wind noise.
I also went to my dealer and tried a new, one month old 07, and it was worse than mine.
The weird thing is, with mine al least:
Some days, very short periods.. there's almost no wind noise at all, even at 80 MPH,.. which seems to depend on the weather temperature.
Don't know if anyone has fixed, or had theirs fixed successfully, but I'd certainly like to hear someone say they did, and if so.. How? .
