This youtube shows my exact issue. How do I fix it? No one commented how they really fixed it.

 

You can pull up the You Tube video titled "Leak for cadillac cts 2009 sunroof". Read through the comments to see if any are helpful. Good luck.

 

hopefully this thread will help...

Stop the (soaking carpet) insanity forever! - Ultraview...

Hey everyone, I think I may have figured how to keep your Ultraview roof equipped CTS bone dry regardless of the cloudburst or carwash. Earlier this Spring I was cleaning the interior of my car and heard the definite sound of stepping in water when i put my foot down behind the driver's seat...

www.cadillacforums.com

Bill

 

I just had this exact issue on my 2011 CTS. My drain tubes were clear but water was coming in at the rear corners, dripping through the headliner. There is a piece of crap tape that is supposed to seal the side tracks to the rear drain catch basin. This tape fails over time. You will need to remove the rear glass panel to get at this and remove this tape and seal the joint between the where the aluminum track meets the plastic drain tube catch basin. Use some silicone caulk. Look at this thread for more details https://www.**********.com/threads/how-to-get-rid-of-the-dreaded-sunroof-leak-not-just-clearing-the-drains-and-crossing-your-fin.149906/ Somehow this site will not let me link properly the other site. But is is a site for C T S V Owners and that is what the site is called.

search this:

How to: get rid of the dreaded sunroof leak, NOT just clearing the drains

 

The above thread is from that "other" forum.
Just replace the asterisks with cts v owners (no spaces)...

 

I just had this exact issue on my 2011 CTS. My drain tubes were clear but water was coming in at the rear corners, dripping through the headliner. There is a piece of crap tape that is supposed to seal the side tracks to the rear drain catch basin. This tape fails over time. You will need to remove the rear glass panel to get at this and remove this tape and seal the joint between the where the aluminum track meets the plastic drain tube catch basin. Use some silicone caulk. Look at this thread for more details https://www.**********.com/threads/...dreaded-sunroof-leak-not-just-clearing-the-drains-and-crossing-your-fin.149906/

 

CTSV
OWN
ERS


Link is no good. This website does not allow links to other forums, like *********** which is crazy.

 

Hi CTS team! Just like everyone else my CTS leaks from the sunroof. Had a big puddle in the back right so I pulled the headliner and cleared all the tunes front to back, but I’m noticing that it’s beginning to leak where the drain plastic tube from the sunroof where it connects to the tube to the fender. (By the bolt in the sunroof) I ran wire up there and even blew on it and it’s clear but still leaks from both sides at that same juncture. I heard that there is some crap tape under the sunroof glass that comes loose and people rtv that space. Anyone here have this issue??? Thanks!

Yes I’m now having the same issue! I’m trying to figure out what to do about it.

 

Post #4-- follow the link.
If that doesn't alleviate your issues, you may have to drop the headliner.