Light Squeal

[byrds6]

My 2007 Tahoe with the 5.3L engine keeps squealing. The belts have been replaced along with the tensioner, idler pulley and alternator. What else can be causing it to squeal? It doesn't do it at idle only when you hit 1.5k to 2k RPMs. Any help would be appreciated. Thanks.

 

[Goodinblack]

Hot or cold?

 

[byrds6]

More noticed when hot

 

[GM Customer Service]

Hey byrds6,

I see you’re trying to figure out why your Tahoe keeps squealing. Although I can’t provide you with any technical advice, I can assist you by looking into this concern and creating a case in our system. Please send me a private message if I could be of any assistance.

Jennifer T.
GM Customer Care

 

[BlueTahoe2001]

Thats interesting you have replaced those parts and are only getting a squeal when hot and not cold. Usually it's the belt when cold. Could it the be the alternator once it gets warmed up and at higher RPM's?

 

[byrds6]

Alternator has been replaced. The only thing that hasnt is the small tensioner on the AC compressor

 

[992dr]

I had the same issue with my 99 Tahoe.
Not sure if it would be the same with the NNBS Hoes but my 99 offered two different size belts. It was roughly an inch longer than the one specific for my Tahoe.
It may be something to look into to.

 

[BlueTahoe2001]

Alternator has been replaced. The only thing that hasnt is the small tensioner on the AC compressor

Whoops didn't see that in the original post! As 992dr mentioned check and see if there are 2 belt lengths and if not maybe the tensioner on the AC compressor would be the last thing to check.

 

[byrds6]

I would assume the belts are the correct length since the dealership I bought it at put them on. Sad thing about it is the dealership is also the ones that replaced the alternator and said it was that causing the squeal. Its also a bit odd that sometimes even hot it doesnt seem to do it.

 

[Goodinblack]

Take off all the belts and start it. Rev it up to 2k

Don't run it for more than a little bit because you have NO water pump function

 

[byrds6]

What would that do for me goodinblack?

 

[992dr]

I would assume the belts are the correct length since the dealership I bought it at put them on. Sad thing about it is the dealership is also the ones that replaced the alternator and said it was that causing the squeal. Its also a bit odd that sometimes even hot it doesnt seem to do it.

You know what assuming does?
The dealer is the last place I would trust. Look at what happened after they replaced your alternator.

I would at least double check on that belt. I had the same symptoms, it was not consistent but very annoying.

Running it without the belt would narrow it down to it being in the accessory drive, I guess.

 

[byrds6]

If I could get it to do it every single time now removing the belts would be a good diagnostic tool. Sadly now its not doing it every time it hits the RPM range lol. What a pain in the rear.

 

[byrds6]

Took it to Firestone and had the lower tensioner replaced. Sad thing is it still squeals and they said for sure that is what was causing it. Might actually be worse now. Lol.

 

[byrds6]

Fixed! The drive belt had to be replaced because it glazed over. From what I was told probably due to the new tensioner putting too much tension lol.

 

[ccapehartusarmyINF.(ret)]

I just recently changed my belts and i was lazy and decided to change them without taking off the fanclutch and top of the fan shroud holy crap that turned out to be a pain in the ass