AZSCTACO

Has anyone else had this issue??? It happens about 5-10 seconds after I start the truck and sometimes it chirps/squeals for a split second and sometimes it squeals for 2-3 seconds (embarrassing). It definitely has something to do with the A/C cause it only does it when it kicks on.

I’m bringing it in on Monday to the dealer but curious if anyone else had the same issue. I am thinking it is either the belt tensioner or maybe having something to do with the A/C clutch….maybe locking up and making the belt slip. Any input?????

07' Tahoe 5.3 by the way.....

ZX1100F1

Have the dealer reference GM Document ID #2022356

stickershock

We have a similar issue with our 2004 Impala, except the A/C has nothing to do with that chirping sound on start up. Ever since we had a water pump replaced a month ago, we have this chirping sound under the hood... and no.... it isn't a birdnest in our air cleaner box! (although that would be a sweet relief and easy solution). So far, no problems have arisen from our chirping sound. By the way, the chirping stops after warmup.

Maybe the belt is too lose? Misery loves company, so you members might kill two complaints with one solution?

in2pro

ZX, what does the document refer too If I may inquire...

AZSCTACO

X2.......

ZX1100F1

There is a software calibration update to address an issue caused by the A/C compressor trying to move liquid refrigerant through the system which can cause a squeal for a second or two.

AZSCTACO

Thanks ZX....appreciate it

AZSCTACO

Well....I brought it in today and they say that it has the "latest and greatest" software updates already and they can't re-create it to happen (of course). It actually squeeled the other day when I remote started it so bad that it kept on squeeling for 3-4 seconds until the truck shut it self off. What the dealio?????????

in2pro

The truck shut down due to the squeal ?!? it would seem to me that it would have to be some serious lock up or drag on the engin to do that and would have to be leaving some serious tracks of rubber somewhere...
Have you inspected the belts to see which one is dragging and possibly where? AC clutch/idler pulley...
I'd get up under it first thing in the morning after it has sat and use the remote to fire her up and see what and where its hanging up.
Maybe the AC cluch is staying engaged? bent or damaged?
Idler pulley bearing worn?
Belt on backwards?
Maybe the belt(s) was defective to begain with and is just too loose?
wiring to the AC clutch shorted or intermittent?
Just some ideas or places I would start...

BMoTahoe

I would also check to see that the wheel on the belt tensioner is actually turning.