Hey Scotty and friends. I have a 2013 Chevy Sonic RS with about 86,000 miles on it. When I turn on my A/C it makes a high pitched noise that sounds like it'll blow my head off. It only happens when the A/C is on and only when I'm idling and stepping on the gas (doesn't seem to happen if I'm coasting). I changed the serpentine belt because that's the obvious fix, but it still happens. What could be wrong?
Can you please make a YouTube video of the noise & post the link here?
If you have a manual belt tensioner, adjust it. If it has an automatic tensioner, the belt tensioner might be faulty.
That sounds like it makes sense. I'm going to my mechanic in a couple days, I'll have it checked out!
Change your cabin filter and clean our any crud that might have gotten in the plenum.
Can you please make a YouTube video of the noise & post the link here?
https://www.youtube.com/watch?v=ThyfmV4qC6E&ab_channel=JustVince
Here's the video.
Sounds like it’s one of the pulley’s.
Are all of the dash vents open all the way?
Passengers sometimes shut off a vent, and this will cause a high pitched sound.
