I've got a 2007 Chevy Silverado classic W/T with a V6. 115K miles. Serpentine belt has been replaced 4 times in the last 2 years. Belt tensioner was replaced a year ago. Squealing goes away for a time then comes back. Replaced the belt AGAIN last week. It was quiet for a week and now it's back. This is getting to be a costly pain in the butt. Any suggestions?..
Thanks everyone.

 

Are you 100% sure it is the belt that is making the noise.

 

Put some of that NAPA belt dressing on it. It works good. Does the truck have A/C?

 

This is the first that I have ever heard of a serpentine belt making noise. The belt lays flat on the pulleys. Not like a v belt that goes down in the groves. So that tells me a pulley is stopping for just a very short time, if you have AC i would look at the clutch.

 

They actually do tend to squeel, but as you said, it is a pulley that't not turning a lot of the time. A good one to also check is the idlers.

 

He said he replaced tensioner so yes if it were me I would take the belt off and check every pulley real good. But I am putting my money on the AC clutch.

 

Yes it apperars to be the belt. I've tried belt dressing and it quiets for a short time...very short....sometimes a full day. Once the belt is removed, the noise is completely gone. I understand that doesn't necessarily mean it is the belt. I will look at the A/C pulley/clutch. Someone also told me the lower pulley on the harmonic balancer could also be bad (damaged) causing the belt to wear prematurely.

Thanks for the help. I will post back when I find this problem.

 

I'm not talking about the tensioner, I'm talking about that one little pulley down there and does nothing. Just a bolt to through the middle to bold it to the block. I have had it go out quite a bit. It's right below the alternator.

Is there any chance the truck was ever wrecked?

 

No...never been in a wreck. My wife doesn't drive it.

 

I'd check the idlers. There is one or two that roll on the flat spsmooth side of the belt, and that is usually where the noise comes from.