Quote Originally Posted by Abrasive View Post
I can't remember off the top of my head if the '04's have the same seal. I know they have a similar cowl design. The directions here are for up to '03, so you might have to just use it as a guide as some things may not be 100% the same.

The OnStar antenna on the roof is also a very common problem. A friend of mine had the same problem and the dealer just replaced the antenna and it fixed the leak.
Yep, sure enough...

I went out and the 04's do indeed have that same disastrous design... Even better, mine does have cabin filter installed from factory... SOOO I better replace that ASAP because I'm sure it will be full of mold/mildew if it isn't already.