DenaliHD

The dealership said that they suspect the drain tubes were clogged. They checked it out right there in the service bay by pouring water in the front corners. The water poured out from behind the front tire wheel wells. They suspected that it was the satellite shark fin or possibly the third eye brake light. They didn’t have time to look at it and needed to make a follow up appointment. I have since taken some clear silicone and went around the shark fin and third eye brake light and had the carpet cleaned and dried. Smell is gone somewhat now. Looking to buy some thin rounded rubber weather strip to go around the three sides of the sun roof. If all else fails, deactivate the sun roof and silicone the gap between the roof and the glass. I’ll never buy a sun roof vehicle again.

With an unusually wet 2019 spring here in Arkansas, sunroof/shark fin leaks still leaking. So very pissed off at GMC for this design flaw. I have taken the truck to the dealership so many times they know everything about me before I get out of the truck. Now the floor board and carpeting is ruined as it is soaked. I showed how much water was coming out as I used my hand like a squeegee on the carpet. I left it with them, after two days, they called and said that I needed to have the carpet cleaned and dried as they could not locate the leak unless it was dried out. They even said with the amount of water in the carpet that I must have left a window open. Took the truck to have it cleaned and dried out. Was told by the detail shop that I was one of many people that had the same problem. Took the truck back to the dealership for their “water leak check.” Later that same day they called and said that they suspect it was the windshield after I had it replaced after a rock flew up while driving and cracked the windshield. I took it back to the place that replaced the windshield to have it checked or replaced. it passed their inspection. I took it back to the dealership on a day it was raining and yes, it was dripping from the roof console and sun visor clips. Carpet was soaked again. Now the mildew smell is horrible and almost unbearable. If this is what you get for buying a $70k truck, GM can have it back.

I have "water checked" the shark fin myself with no leaks. My driveway does have a slight slope to the left in my normal parking spot. I will re-attempt the "water check" again in the "normal" spot on my day off. I am confounded on this issue as it has rained hard here today with no leaks on level ground. I know it was fully closed before this second leak, before exiting my truck I have made it a habit to push it to the closed position on the switch after the first leak. I can only deduce that the current seal is: there is a defect in the seal itself. I have had sunroofs in other vehicles and they never leaked and they were not garage kept.

I can't park my Denali in the garage due to the garage being built too short in length to accommodate my Denali HD.

Sunroof leaking yet again...NOT HAPPY!!! After taking it in for repairs, I have opened the sunroof a dozen or two times 2 months after being serviced at the dealership. Last Sunday morning it was pouring down rain for 3-4 hours. Went to get in to go to the store, drips coming from both sides of the control header above the rear view mirror. The headliner was soaked from about mid driver's seat to the center overhead console on both sides. Center console had water up to the top of the rubber cushion at the bottom of the console well. Both front seats were wet (leather heated and cooled). I ensured the sunroof was closed and have driven days earlier in rain with no leaks. (I am the only driver). I did not open the sunroof in the past month prior to this event. I have not checked the shark fin seal.