Loud Squeaking Noise on 2008 GMC Sierra 1500

There is a bloud squeaking noise coming from the belt and pully area, it is continous. What would be the best guess as to what the problem is?

by in Gretna, LA on January 17, 2010
1 answer 1 comment
ANSWER by on January 17, 2010
As an automotive technician, I don't like to guess, I prefer to diagnose. Guessing will almost always result in replacing un-needed parts. You can try spraying the belt with a quick shot of WD40 or silicone spray, if the noise goes away, you have a bad belt or the alignment of the pulleys is off. The key is to locate the source of the noise, you have a lot of rotating parts in the belt area, waterpump, alternator, p/s pump, idler bearings etc. and all these can make noise. I use a stethoscope and carefully listed to each part and try to locate the noisy part, this can be done with a large screwdriver too, but be very very careful!
COMMENT by on June 26, 2011
I have the same problem with my truck!!