Leaking roof liner

[paulb55]

I FEEL FOR YOU! We had this in our Denali. After replacing the XM antenna, and still having 3 more leaks...it was determined it was the sunroof. The had to replace the entire assembly and then there was still problems. I actually went the route of a buy back. I am so sorry you are having to deal with this. Just remember, document, document, document.
Also, they do forget that you can go 3 weeks without an issue because its tied to newsflash...rain.

 

[68 Grand]

There are multiple bulletins for water leaks.

Antenna needing replacement:

http://sandyblogs.com/techlink/?p=4683

Sunroof seal needing replacement:

http://sandyblogs.com/techlink/?p=5166

Multiple areas around the C-pillar needing service:

http://sandyblogs.com/techlink/?p=4890

Might be wise to take a video camera and go through a car wash to see what you can record.

 

[khiroshima]

Thanks for everyone's replies - Just circling back to confirm that GMC replaced my OnStar antenna and sealed it (properly), like 68 describes above, they have seen this issue before. I use ApplePlay for nav, so I didn't even care that nav wasn't working, but they identified that they needed to replace the antenna itself. The job took a day, but they did need to overnight the antenna. I will have to wait for the next rain to see if the problem is indeed fixed (looks like later this week). Thanks again! KH

 

[AngelXL]

I'm pretty sure they use a water hose to test...