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Discussion Starter · #1 ·
Did anyone ever find a solution to the water pouring out of the seatbelt assembly and lights after it rains?? No one ever came back to the forum with a solution. Some claimed it was the drainage tubes, others said it was not.
 

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I apologize for not getting back to you guys about this. I went to the dealer three times and they had my Suburban for three of the four weeks right after I purchased it. That was really frustrating; the last time I went in with video of the leaks and they took me seriously.

I'm not very good at explaining things so I took some pictures to help.

I was told that one drain at the rear of the sunroof was kinked causing the water to back up and not drain. The water then collected and built up in the headliner, sloshing around and gushing out when I backed out of the driveway and started driving. Take a look at these pics, I hope I explain so it makes sense.


Pic 1 - This is the slope of my driveway and the green circle is where the replaced drain is located. Parking uphill caused the water to pool in the back. By the way, this issue only happened when pulled in, if I backed into my driveway I had no leaks.
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Picture 2 -This is from the dealer while they had the headliner out. The green drain line is kinked up towards the roof instead of draining down. Somehow this caused the water to back up, I guess there was too much water trying to drain and no air could escape thus causing the water to back up and overflow. Pic says "upward link", should be "upward kink"...fat fingers
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Picture 3 - Don't mind the baby, that's my little helper :) This is a view from directly above (passenger side). Circled in red are two of the many drains from the sunroof channel, that for some reason I don't understand drain from the channel to inside the vehicle. These allow the collected water to get into the space above the headliner.
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Picture 4 - This view is from the passenger side, standing on the running boards. This is a side view of the drains from pic 3, look at the left drain and you can see the headliner through the opening, underlined in blue.
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Picture 5 - This is from inside the vehicle, sitting in the driver's seat looking up above the passenger. Circled in red are the same drains from pics 3 and 4. It's hard to tell but the drains are under the weather stripping and above the headliner. If you get a hose and run it in the sunroof track you can see how the water leaks from the track into the space above the headliner.
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So, that's what I found out about the issue, and it seems to have worked. I live in NJ and we get a lot of rain, there have numerous storms since the repair and I have had no issues. I hope this helps.
 

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Discussion Starter · #4 ·
Well, after GMC supposedly fixed my problem, it rained last night and water poured out just like before, only this time it also leaked out of the overhead console up front with the lights in multiple electrical controls are! So I go back to GMC for the third time tomorrow. Overall my car has been in the shop 21 days. According to California lemon law, if they can’t fix it in under 30 days, I get a new car. Also if I brought it back three times for the same problem, this might also qualify. I think I’m gonna get a ‘22 Yukon XL very soon. That will be great, as long as it doesn’t leak!
 

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Did anyone ever find a solution to the water pouring out of the seatbelt assembly and lights after it rains?? No one ever came back to the forum with a solution. Some claimed it was the drainage tubes, others said it was not.
Just started with a similar issue. Did you ever get yours fixed / sold / or drove to the woods and started on fire?
2021 GMC Yukon Denali XL
I bought my Yukon New off the lot Nov27th 2020 for just under $80k.
We’ve had it just 25 months.
Beautiful SUV, We love it.
Well we did anyway..
December 2022 Noticed a water leak.
Water is coming out of the headliner and getting on the 2nd and 3rd row seats, as well as the carpet, speakers, etc…
Went to my local GMAC Dealer / Service desk.
I had a sneaking suspicion this wasn’t going to end well or make me happy.
I was told that this is common, and that happens when the sunroof drain becomes clogged.
Did some checking and found out that the drains on my vehicle are not visible.
Drain tubes are located at the back of the sunroof, beneath the second piece of glass.
By the way the second piece of glass doesn’t move.
Apparently the only way to get to it is to remove the headliner.
And I was informed that this is not covered by my warranty! and I shouldn’t get upset because it’s just an object.
Absolutely perfect!!! Leaking wet, damp, about to mold, stink and rot…. So of course a 3 year bumper to bumper wouldn’t cover it.
Why would it!!!!
 

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Just started with a similar issue. Did you ever get yours fixed / sold / or drove to the woods and started on fire? 2021 GMC Yukon Denali XL I bought my Yukon New off the lot Nov27th 2020 for just under $80k. We’ve had it just 25 months. Beautiful SUV, We love it. Well we did anyway.. December 2022 Noticed a water leak. Water is coming out of the headliner and getting on the 2nd and 3rd row seats, as well as the carpet, speakers, etc… Went to my local GMAC Dealer / Service desk. I had a sneaking suspicion this wasn’t going to end well or make me happy. I was told that this is common, and that happens when the sunroof drain becomes clogged. Did some checking and found out that the drains on my vehicle are not visible. Drain tubes are located at the back of the sunroof, beneath the second piece of glass. By the way the second piece of glass doesn’t move. Apparently the only way to get to it is to remove the headliner. And I was informed that this is not covered by my warranty! and I shouldn’t get upset because it’s just an object. Absolutely perfect!!! Leaking wet, damp, about to mold, stink and rot…. So of course a 3 year bumper to bumper wouldn’t cover it. Why would it!!!!
 

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Push your dealer for an extended original manufacturer warranty to cover any issues potential caused by the leak.
Just started with a similar issue. Did you ever get yours fixed / sold / or drove to the woods and started on fire?
2021 GMC Yukon Denali XL
I bought my Yukon New off the lot Nov27th 2020 for just under $80k.
We’ve had it just 25 months.
Beautiful SUV, We love it.
Well we did anyway..
December 2022 Noticed a water leak.
Water is coming out of the headliner and getting on the 2nd and 3rd row seats, as well as the carpet, speakers, etc…
Went to my local GMAC Dealer / Service desk.
I had a sneaking suspicion this wasn’t going to end well or make me happy.
I was told that this is common, and that happens when the sunroof drain becomes clogged.
Did some checking and found out that the drains on my vehicle are not visible.
Drain tubes are located at the back of the sunroof, beneath the second piece of glass.
By the way the second piece of glass doesn’t move.
Apparently the only way to get to it is to remove the headliner.
And I was informed that this is not covered by my warranty! and I shouldn’t get upset because it’s just an object.
Absolutely perfect!!! Leaking wet, damp, about to mold, stink and rot…. So of course a 3 year bumper to bumper wouldn’t cover it.
Why would it!!!!
I am in your exact situation. Got my Yukon Denali in October 2020 and had zero issues until the last storm which gave us two days worth of rain. Our interior ceiling was soaked! My car has been with the dealer for 11 days now and we just received word that a ticket was opened with GM engineers. Last I heard they removed true headliner to further investigate where leak is coming in from. What a disaster!
 

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I have had the same issue with the new 2021 yukon denali I purchased 12/2020. I have had my suv in times to fix different leaks (back seat foot area - water & mold. It was in for a month), front passenger (wheel well and coming out the seat belt & driver side leak) and front passenger side closer to the console. The suv was in to a different dealer for the last leak because they could get the vehicle in to their shop in 2 weeks instead of the other 3 dealers 2+ months. This dealer had really good customer service (FINALLY!); however, I received the car back on Thursday and the carpet is now very wet. Has anyone had success with getting a replacement vehicle? if so, did you go to the dealer or call GM customer assistance. Would love to hear any information. I love this vehicle but the leaks are not getting fixed and with one exception, the customer service has been subpar.
 
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