Water sloshing sound in roof?

[SnowBuck]

Couldn't you just blow air thru the tube at the top to empty is and see if that makes any difference?

 

[yukontruckman]

That does sound like a "gurgling" mixture of air and water within a hose.

 

[Rocket Man]

Couldn't you just blow air thru the tube at the top to empty is and see if that makes any difference?

Might be able to find the exit that way too, or run string trimmer line from the top and see where it exits, and then see if it’s in a place where air will blow up it when at speed.

 

[B520044]

This is what I'm worried about! It seems the problems will just increase once headliners and door trims are removed. Cheap plastic is never the same once removed. Maybe I'll reconsider and stick to my "foam" fixes.

One thing is that the sound changes from left to right if I make a turn. So there must be left and right side drains.
If I park for a while, then drive the sound is gone. So I definitely think that wind is blowing up into the lines preventing water from draining. Lucky that water isn't pouring into the headliner!! Or maybe I better check for wet spots, because I had to spray cologne in cabin to hide smells. Just blamed it on my kids, but could be musty water smell.

 

[B520044]

Interesting TSBs here: https://www.carcomplaints.com/GMC/Yukon/2021/tsbs/
Many of which have been discussed/experienced by forum members.

Found this:

 

[Rocket Man]

Aha, there is a TSB relating to a gurgling sound from the sunroof drains and the suggestion is to turn on the HVAC blower to clear the drain. Interesting. . https://www.carcomplaints.com/GMC/Yukon/2021/tsbs/tsb-pit5761.shtml

 

[Bigmanny]

You know what they say- never buy the first production year. There’s a few things that the 2021’s are suffering from, add this to the list. Hopefully GM will get these issues figured out by the next model year. Until then, a few visits to the dealer will be in order.

 

[Bigmanny]

I missed your first post where you provided the TSB. Very Helpful. However, people in the 2021 forum really don’t want to hear about buying the first model year. We did. That is why we are in the 2021 forum looking for answers or hopefully some mods/aftermarket accessories.

 

[Rocket Man]

I missed your first post where you provided the TSB. Very Helpful. However, people in the 2021 forum really don’t want to hear about buying the first model year. We did. That is why we are in the 2021 forum looking for answers or hopefully some mods/aftermarket accessories.

All I said was that you should expect these things since it’s a new model year, it’s an obvious observation although not everybody knows. It still deserves to be mentioned, if not for you then maybe somebody else who might be here thinking about buying. There’s still people who buy the first production year and are surprised with all the new issues. Sorry if you don’t want to hear that. I’m here because even though I don’t have a 2021 I can still be of help at times. You’re welcome for the link to the TSB although it was @B520044 that got me headed that direction.

 

[B520044]

Yeah, I know all about first model years. I go through a lot of new cars. It's my kryptonite. Just over the last 6 years I've had 2014 grand Cherokee, 2015 Genesis sedan, 2016 F150 with the 2.7L ecoboost, 2017 Nissan Titan, 2016 Expedition, 2019 Ram 1500 and now the 2021 Yukon. I really, really want to make this one stick around.

Out of those vehicles the most reliable was the Genesis and Titan. Not a single recall or TSB that I had to bring in for. Of course I didn't keep them long, but all the rest have been extremely problematic. Hell the F150 was the worst. The engine smoked bad at startup and the interior sounded like it was put together with Dixie cups.

 

[Doubeleive]

From what I hear the dealers are breaking as many things as they’re fixing right now until they get experience disassembling the interiors. Good call.

sounds about right I have to drop the silverado off tomorrow for them to put in a new cluster they want it for 2 days, lol I was like ok.... I suspect that's in case they break something and have to replace it hahaa, but they did say they want to check the next day and see if the problem is resolved that it does when it is cold.

 

[BigJohn76]

The drain tubes run into the A post and drain out the bottom onto the ground. Open the sunroof and stand up in it and you can see the drain openings in each front corner. A coat hanger or large string trimmer line can be pushed into them. You can pour some water on the tray up there and watch it hit the ground if you have them cleaned out.

 

[Rocket Man]

The drain tubes run into the A post and drain out the bottom onto the ground. Open the sunroof and stand up in it and you can see the drain openings in each front corner. A coat hanger or large string trimmer line can be pushed into them. You can pour some water on the tray up there and watch it hit the ground if you have them cleaned out.

Why would the TSB say to turn on the hvac, turn it to fresh air, and run the fan to clear the sunroof drains then? Are you sure you’re talking about the 2021’s ?

 

[B520044]

Why would the TSB say to turn on the hvac, turn it to fresh air, and run the fan to clear the sunroof drains then? Are you sure you’re talking about the 2021’s ?

Yeah, I don't get it. BUT, today it rained and on drive home from work it started gurgling again. I turned off the air circulation and left the fresh air running. The water sounds went away. Crazy, not sure why this is tied into the hvac vents?

 

[Rocket Man]

Yeah, I don't get it. BUT, today it rained and on drive home from work it started gurgling again. I turned off the air circulation and left the fresh air running. The water sounds went away. Crazy, not sure why this is tied into the hvac vents?

Not sure but it must go to the same drain as the hvac wherever that is. I know there’s always water that drains out after using the ac so it must connect to that.

 

[olyelr]

You guys are narrowing it down!

 

[Holy Roller]

Placing the HVAC on fresh air, and increasing the fan speed, raises the air pressure inside the cabin, forcing the water down the drains.

HVAC on recirc decreases cabin air pressure, relative to the pressure of the air pushing against the bottom of the sunroof drains. Thereby causing water to drawn like a straw gurgling up through the hoses.

Many years ago (maybe 20 or more) there was a TSB regarding dust being drawn up around door seals due to the negative cabin air pressure relative to that of the air rushing around the exterior of the moving vehicle. I can’t quite recall, but it may have been for the Gen 1 1999-2000 Escalade, that introduced triple door seals on the GMT-400 platform.

 

[SAdude]

This is happening to me. Anyone get the dealer to fix it?

 

[exp500]

Extend the drain tubes 2 inches or so lower than presently. Cut end of extension at 45 degree with taper facing rear. It is an Air pressure problem, why turning blower/outside air on helps.