Interior Water Leak

[Atstew01]

Any thoughts on where this is coming from? It showed up about 30 minutes into a hard rain. New to me 16 Yukon. I pulled off the trim and did not see any trace of water inside.

 

[Blueinterceptor]

Some people used find water issues coming from the roof antenna. Is the windshield original

 

[wu6fiend]

I'm betting its the shark fin antenna. I had a leak from mine (2016 Yukon), and when I took it in, there was an HD2500 Silverado in the service bay, same issue, and the rental Suburban they gave me, guess what? Also had a water leak. The service writer said the issue is very wide spread. Mine had to go to the body shop as the sheet metal underneath the antenna needed to be flattened, so they could get a good seal with the replacement antenna. Since the replacement, dry as a bone. Good luck.

 

[khiroshima]

^^^ This . . .
Agree, I did the same - got a replacement OnStar antenna and all is good again. Lame design and lame that GMC doesn't fix these before they go out the door

 

[dbbd1]

Does anyone know how to remove the shark fin antenna?

 

[Atstew01]

Any thoughts on where this is coming from? It showed up about 30 minutes into a hard rain. New to me 16 Yukon. I pulled off the trim and did not see any trace of water inside.

View attachment 180392

It was the antenna. Dealer replaced it and my carvana warranty paid for it. I haven't had it in the rain yet so we will see if it worked!

 

[wu6fiend]

Water leak is back. So, its back to the dealership again next week. Of course, its the rainy season here, and I have to park outside. The Yukon is wearing a "hat" on its shark fin antenna, constructed of duct tape, courtesy of the dealership, for now. The service adviser said they are doing a steady business repairing water leaks under warranty, many, many Tahoes/Suburbans/Yukons/Escalades/Silverados/Sierras are coming in, for the same exact issue, traced to the shark fin antenna.

 

[Doubeleive]

I wonder who's going to loose there job at GM over that one, lol

 

[JTRATX]

Possibly could be the sunroof drains if you have a sunroof??

 

[wu6fiend]

Possibly could be the sunroof drains if you have a sunroof??

My wife thought the same thing. Although, the vehicle has never been parked under a tree, has been frequently washed, and is often parked indoors while I'm at work. I just find it unlikely that debris could block the sunroof drains. Anyway, it goes in on Tues, so we will see.

 

[Rdr854]

Water leak is back. So, its back to the dealership again next week. Of course, its the rainy season here, and I have to park outside. The Yukon is wearing a "hat" on its shark fin antenna, constructed of duct tape, courtesy of the dealership, for now. The service adviser said they are doing a steady business repairing water leaks under warranty, many, many Tahoes/Suburbans/Yukons/Escalades/Silverados/Sierras are coming in, for the same exact issue, traced to the shark fin antenna.

What model years are impacted by the water leak at the shark fin antenna?

 

[JTRATX]

My wife thought the same thing. Although, the vehicle has never been parked under a tree, has been frequently washed, and is often parked indoors while I'm at work. I just find it unlikely that debris could block the sunroof drains. Anyway, it goes in on Tues, so we will see.

Test the sunroof yourself at home. Open the sunroof, and pour a cup of water in the front two corners of the sunroof tracks, you should see a tiny hole in each corner of the sunroof tract. If draining properly the water will come out under the A pillar on each side of the truck.

 

[wu6fiend]

The source of the leak was the shark fin antenna, again. Fingers crossed the second time to the dealership is the charm. This is a very common issue, I learned, including the 2015+ SUVs and 2014+ pickups. Keep an eye on the headliner on top of the A pillar, right above the plastic trim piece beside the windshield, that's where the leak will show up first, in my experience.

 

[wu6fiend]

So far, so good, dry as a bone. Coincidentally, my wife ran into the fellow that owns the company that just repaired my Denali. The dealership farms out this work to a company that specializes in repairing water leaks. He told her the central issue with these shark fin antennas is not the antennas themselves, but rather the surface they are mounted to. The roof surface is not completely flat (as it curves ever so slightly), while the antenna bottom is perfectly flat. Ergo, not a good mix. So simply replacing the antenna (which the first dealership did) will not solve the problem. The latest solution is to add a lot of sealant to the surface, prior to remounting the antenna to the vehicle. He said they are doing a steady business fixing GM's SUVs and pickups with these antennas.