wind noise/flapping after washing car/rain

[yahtzee]

I have a 2021 Yukon Denali and after a car wash and back to highway speeds, there is a pretty consistent tapping/flapping noise coming from outside top of truck. I believe I have narrowed it down to the strips that run down both sides of truck under the roof rail frame. If you look at them right by the windshield, the front of them are pretty loose. I have to think air is getting under them and moving around the excess water until it's gone (usually 3-5 mins at 70mph). Has anyone experienced this?

[Kristina Fennell]

Yes, mine is right over my head around the antenna area, when driving 60+ and rain... 2021 Tahoe z71

[Jennifer Clark]

Yes, 2021 Tahoe Premier, after rain or car wash, I hear the same sounds, also have water in driver side floor - been to dealer to fix, upon return issue came back, its back at dealer as we speak! Someone mentioned it could be an issue with the sunroof drain? We will see

[Z068u]

Yes, same here in 2021 Tahoe high country. Has anyone made the dealership aware? Can they figure it out and get a bulletin for it? It’s very annoying. 

[Z068u]

Yes, same here in 2021 Tahoe high country. Has anyone made the dealership aware? Can they figure it out and get a bulletin for it? It’s very annoying. 

[tpgunn]

You are hearing the water in the drain tubes from the top of the vehicle.   This is normal.  Try changing the HVAC to fresh from recirculate and increasing the fan speed.  This changes the cabin pressure and forces it to drain quicker.  Or turn up the volume on the radio.

[newdude]

Here is the PI on it:

 

Quote

 

#PIT5761: Gurgling Sound While Driving At Highway Speeds After A Rain or Car Wash - (Aug 3, 2020)

 

Condition

Some customers may comment after a soaking rain or car wash if they drive at highway speeds with the HVAC off they can hear a gurgling noise.  This noise could be coming from the left or right front sunroof drains.

 

Cause

Residual water still in the sunroof drains.

 

Correction

To help clear the residual water from the sunroof drains, turn on the HVAC blower and set the recirculation door to fresh air mode. This will clear any residual water from the sunroof drain tubes.

 

[toasty]

Found this posted online - 

[Dan Flaherty]

Yep !!

I thought I was going crazy 

after rain or car wash - I describe it as ping pong balls between windshield and sunroof

last 20 minutes at highway speed

very annoying 

my dealer in Rochester NY— had it in twice “ can hear it “

just called today - rep said they have a 2021 Tahoe in shop with same thing -told it is a “ normal “ part of drainage sunroof 

should have stuck with my Audi Q7- but wanna buy American 

[DadNoseBest]

I own a 2021 Yukon Denali; purchased in February 2021.  Just this weekend, 7/17,  I have experienced the same noise.  To me it sounds like water hitting the upper roof area near the antenna.  There was intermittent rain during the duration of my 500 mile trip.  Very disappointing for an $85K vehicle.  Also very concerning since I owned a 2007 GMC Acadia that had a persistent water drain tube leak into the vehicle for the duration of my ownership. 

[Jscroggs]

I have in my 2021 yukon xl at4. It drives me crazy. Thats why i am here, looking for answers to same question. Have you learned anything?

[Cmj781]

I have a 2021 Suburban High country I got in Oct 2020. I have always had this problem. When it gets wet or it rains. Same exact thing as everyone is describing. I hope they issue a recall soon to fix. 

[Stephen Moore]

2021 Tahoe LT----noise is as described by others posting.

 

Swishing sound occurs with cross winds regardless of rain or carwash.

 

GM manufacturing needs to find a fix as this isn't normal for a high quality vehicle.

[Pacfanweb]

There's a TSB for a sloshing type noise when driving in the rain.  You extend the front sunroof drains because where they exit beneath the cowl, there's enough pressure there to make them not drain easily and the water builds up jn the trough above your head and you hear it.  

Sloshing, gurgling, etc, type noises.  I've done a few and it works.  

To prove out if this is your issue, when you are hearing the noise turn your A/C fan up and see if it goes away.  That provides enough cabin pressure to force the water out. 

These big double glass sunroofs pass a LOT of water, and this is one of the side effects.   

[Nicholas Craine]

Same we have a 2021 z71 tahoe and after rain or car wash. It comes out of both sides making the noise I have read there is a extention for the drain hose for the sunroof and you need to add the extended hose because otherwise what is currently in there is allowing to much pressure to build up and not allowing the water to properly drain which is the noise we are all hearing. Not sure how this is done yet I am researching it now and once I find out and have the extended hose added I will update if it fixes the issue.

 

 

Edited November 6, 2022 by Nicholas Craine