Purchased my first GM in 30 years, a 2018 Tahoe LS, best truck I’ve ever owned, except for one minor issue - it makes a high pitched whistling noise when the A/C button is engaged and illuminated. Sometimes it doesn’t happen right away, but it always eventually happens.
I have been trying to troubleshoot this with all of my local “experts” for months. My long time trusted mechanic, and then my local dealership service center, both suggested replacing the expansion valve, which I did, but the noise continued. The A/C runs fine, blows very cold, but anytime that A/C is engaged, either cooling down the truck, defrosting, an auto function that uses it, etc. eventually the whistling will start again. A few times I could swear that it was whistling when the A/C wasn’t even on, but I don’t want to go there with this thread
The dealer said that that is the normal operating noise for the compressor, then they actually sat me in a police version of the 2018 Tahoe that they had on site, to show me that it makes the same noise, it did but the noise in that Tahoe was a lot softer. Their position was, it is what it is, Tahoe A/Cs are noisy, live with it. I find it hard to believe that all 2018 Tahoes make this noise, it’s annoying to the point that anyone like me who likes to drive in peace and quiet would bring it in to get it checked out.
Chevy Corporate was kind of useless when I contacted them, and suggested that I bring it to another Chevy dealer for a second opinion. Other forum posts have suggested someone who specializes in air conditioning system issues, or getting/using a stethoscope or the like to really diagnose where the sound is coming from. Sorry, I’m not a mechanic, so I can’t help anyone help me on what to do here.
I would consider replacing the compressor outright, which is an obviously crazy expensive move, if I thought that I wouldn’t wind up with another noisy compressor.
Not sure what to do here or where to go, hoping someone reading this might have some suggestions.
I have been trying to troubleshoot this with all of my local “experts” for months. My long time trusted mechanic, and then my local dealership service center, both suggested replacing the expansion valve, which I did, but the noise continued. The A/C runs fine, blows very cold, but anytime that A/C is engaged, either cooling down the truck, defrosting, an auto function that uses it, etc. eventually the whistling will start again. A few times I could swear that it was whistling when the A/C wasn’t even on, but I don’t want to go there with this thread
The dealer said that that is the normal operating noise for the compressor, then they actually sat me in a police version of the 2018 Tahoe that they had on site, to show me that it makes the same noise, it did but the noise in that Tahoe was a lot softer. Their position was, it is what it is, Tahoe A/Cs are noisy, live with it. I find it hard to believe that all 2018 Tahoes make this noise, it’s annoying to the point that anyone like me who likes to drive in peace and quiet would bring it in to get it checked out.
Chevy Corporate was kind of useless when I contacted them, and suggested that I bring it to another Chevy dealer for a second opinion. Other forum posts have suggested someone who specializes in air conditioning system issues, or getting/using a stethoscope or the like to really diagnose where the sound is coming from. Sorry, I’m not a mechanic, so I can’t help anyone help me on what to do here.
I would consider replacing the compressor outright, which is an obviously crazy expensive move, if I thought that I wouldn’t wind up with another noisy compressor.
Not sure what to do here or where to go, hoping someone reading this might have some suggestions.
