High pitch noise with A/C on passenger side

[ish]

 

 

[GMCustomerService]

On 12/4/2018 at 11:55 PM, ish said:

 

 

Hi, ish. If you're still experiencing this high pitch noise and considering visiting your dealership. We would be happy to work alongside them to figure out the root cause. Feel free to follow up with us via private message, we hope to hear from you soon.  

 

Anthony J.

 

[mws517]

I have the 2019 Silverado HD high country. I too heard a similar sound when driving, it turned out to be the air vent. When my wife rides with me, she would close an air vent causing the high pitched sound, when vent opened, it stopped. Took it to dealer and they heard it as well. Said it may be some type of a seal. I couldn't leave at that time but will bring it back.

[kfinnengineer]

I have the 2019 High Country and have heard the high pitch noise.  But, mine happens when I am on light throttle at around 36-37 mph, nothing to do with the a/c for me. I can seem to make it happen or make it stop by the amount of throttle I give it at this speed. Maybe my issue is completely different.  I have also had the radio center display fail, even let the smoke come out of the wires.  I have video of that but I won't share it yet. The dealer replaced the display and the gauge cluster and it just failed the center display again.  This hasn't even been two weeks since the replacement.  

[vegasbob]

I have a high pitched whistling sound when ac is on..turns out it is the left driver upper ac vent...This was on mine ..but I found it...

 

[Brian21477]

On 12/16/2018 at 9:57 PM, kfinnengineer said:

I have the 2019 High Country and have heard the high pitch noise.  But, mine happens when I am on light throttle at around 36-37 mph, nothing to do with the a/c for me. I can seem to make it happen or make it stop by the amount of throttle I give it at this speed. Maybe my issue is completely different.  I have also had the radio center display fail, even let the smoke come out of the wires.  I have video of that but I won't share it yet. The dealer replaced the display and the gauge cluster and it just failed the center display again.  This hasn't even been two weeks since the replacement.  

I have 2020 LT Trail Boss 6.2.  I too get the high pitch sound when accelerating.  Usually between 25-35 mph then it fades out.  Took to dealer twice, both times they replaced parts and couldn’t fix it. Gonna take it back again. Anyone know the fix for this?