Climate recirculation whistle/noise

September 1, 2019

Anyone else have a high pitch noise above 75ish that is linked to the climate control recirculation? At first I thought it was a windshield air leak. Only does it @ 75mph and up or with high winds with either the climate control off or with the recirculatory air on. Had it to dealer about 2 weeks ago. Tech acknowledged the noise and said they would get with GM on what to do but have yet to get back with me. I did a search and found that it's a vent door not sealing in the climate control. Anyone know if it's accessible through the glove boxes?

Tischmic · September 3, 2019

Mine does it too, I had a brand new rental with 40 miles on it, did it as well. I figured it was normal.

September 3, 2019

Not normal. Not the biggest issue I could have, but if that's the best GM can do for $54,000.... Very annoying on a 2 hour drive.

September 4, 2019

Dealer just got back with me and gm responded with the go ahead for warranty repair. I asked about if they needed to romove the full dash and I got a "we'll see" answer. I am scheduled next Wednesday. "We'll see" what happens as they told me over the phone that they are not sure what exactly the will have to do or get into.

dcarbs · September 5, 2019

5 hours ago, 570590 said:

Dealer just got back with me and gm responded with the go ahead for warranty repair. I asked about if they needed to romove the full dash and I got a "we'll see" answer. I am scheduled next Wednesday. "We'll see" what happens as they told me over the phone that they are not sure what exactly the will have to do or get into.

Definitely keep us updated. Mine has done the same since day 1. Dealer said they’d probably have to take out the dash. I’m reluctant because I would rather turn recirculation off on the highway than have my dash rattle....

September 19, 2019

So I finally made it to an appointment to have this checked out. They told me that they took to cowl off and checked the flapper and also took some inside dash trim off and used a stethoscope and determined that the noise is not from the HVAC system. They said there was a lot of wind noise at the bottom passenger corner of the windshield. And that changing the recirculate function is just changing the pressure in the cabin. So now they want to take the windshield out, inspect the area, and reseal the original windshield back.

Vicarod · October 6, 2019

Any update on this condition?

My truck has it...as well as the loaner that I am in.

Edited October 6, 2019 by Vicarod

October 7, 2019

I've been back to the dealer since they wanted to replace the windshield. After my last post I noticed the dealer broke some trim pieces and glued them back into place. I went in and flipped shit. Plastic breaks, and stuff happens, but to hide it and glue it back together is inexcusable. Went to another dealer afterwards. They will not work on it until what was broke from the first dealer is fixed. Waiting on parts during the strike. I will say that I have played with the HVAC settings some more and my problem has specific requirements on the settings to replicate the sound and that kinda tells me the whole windshield stuff the first dealer told me was a bunch of bull. So far I have no answers.

Vicarod · October 7, 2019

Thanks for the update. Hope they get you sorted.

mattsvtcobra · October 7, 2019

13 hours ago, 570590 said:

I've been back to the dealer since they wanted to replace the windshield. After my last post I noticed the dealer broke some trim pieces and glued them back into place. I went in and flipped shit. Plastic breaks, and stuff happens, but to hide it and glue it back together is inexcusable. Went to another dealer afterwards. They will not work on it until what was broke from the first dealer is fixed. Waiting on parts during the strike. I will say that I have played with the HVAC settings some more and my problem has specific requirements on the settings to replicate the sound and that kinda tells me the whole windshield stuff the first dealer told me was a bunch of bull. So far I have no answers.

Oh my! That is terrible. After my last exp in a Chevy dealer... I'm not surprised. It's quite sad these days that they can't do the right thing. It's all about speed, and making the boss happy... not the customer.

Dhxrris · June 25, 2020

Anyone ever get this fixed my 2020 is doing the exact with high way speeds and recirculate!!??!! Thanks in advance and sorry to bump up an old thread!!!

2016 Sierra Owner · June 26, 2020

On 6/25/2020 at 2:05 AM, Dhxrris said:

Anyone ever get this fixed my 2020 is doing the exact with high way speeds and recirculate!!??!! Thanks in advance and sorry to bump up an old thread!!!

This is gonna sound funny. Guys that have complained of this occurring before had to open the rear console air vents. After that they said the sound went away. May want to check those.

June 27, 2020

I have yet to get this issue straightened out. Dealer recalibrated the actuators but didn't help it. Haven't really played with my rear vents to see if that changes it.

wacko · June 27, 2020

I remember similar issue with mine when new. Opened all vents (to far up or down up front restricts flow and to far left or right in rear console vents restricts flow). No issue since adjusting. Current generation System appears to move more air and vent restriction can cause noise for sure.