2005 GMC Sierra serpentine belt

2005 GMC SIERRA

57,000 MILES • V8 • 4WD • AUTOMATIC

PGJCMARTIN

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I am getting what I am pretty sure is a belt squeaking noise. I took a little tension off of the belt by moving the automatic tensioner a few times and the noise went away for a day or so and then returned. I went to buy a new serpentine belt and found that the belt varies depending on what amps my alternator puts out. I have looked under the hood for what alternator I have but cannot find the information anywhere. Do you know how I can find this out? The two choices appear to be either 105 or 145 amps based on going to an auto parts dealer. They did not know how to find out which alternator it was. Thanks.

Nov 13, 2009 at 8:33 PM

OBXAUTOMEDIC

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Hello,

Usually the amps are laser printed on the casing of the alternator, sometimes on top were it can be seen, but of course it can also be on the bottom were you cannot see it. The best thing to do it to take the tools with you to the parts store and remove the belt so it can be compared to the new one.

But before you do that just to make sure it is the belt. With spray lube in hand, with engine off spray the center bolt of the tensioner pulley, then start engine if sqeal is gone for a period of time then most likely it is the pulley bearing that is failing. If still sqealing and it has an Idler pulley turn vehicle off and spray center pulley and restart, if sqeal is gone for a period of time then could be the idler pulley bearing failing.

.

Nov 13, 2009 at 9:04 PM

PGJCMARTIN

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2 POSTS

Thanks for your advice. I will get some spray lube and try that. For the second part of your reply, how would I know if my truck has an Idler pulley. I am unfamiliiar with that.

Thanks.

Nov 14, 2009 at 11:55 AM

OBXAUTOMEDIC

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3,711 POSTS

The Idler pulley will look similar to the tensioner pulley it is just stationary.

.

Nov 14, 2009 at 1:11 PM