belt chirp/squeak

Question

2018 GMC 2500 hd 6.0 60K milesCouple months ago, started getting intermittent chirp from belt/pulleys.&nbsp; Seemed worse in wet weather. Tried trouble shooting. Sprayed water on the serpentine belt and it would stop the chirp temporarily. Figured a new belt would fix it. It did fix it for a few weeks, then it came back.&nbsp; Sprayed water on the new belt again and it would temporarily stop the chirp again for a few seconds. I did a little more investigating and figured I would change the tensioner and idler pulley. Changed both of those and the stretch fit air conditioning belt (which was not fun) but that didn't stop it.&nbsp; Tried another new belt, different brand this time, and the squeaking stopped again...for about only 3 weeks and now it's back. Spray a little water on the belt, and it momentarily stops the squeal. I can't determine exactly where it's coming from, if it's a pulley or what? If its a pulley, why does it stop when I spray a little water on the belt? I did remove the belt and just grabbed all the pulleys and spun them and they all seem to sound good and don't have any play in them.&nbsp; Any ideas?

ib853347201 · Answer

Had a similar chirping&nbsp;happen on our Chevy Vortec 8.1. Cause was diagnosed as the idler pulley which was replaced, problem solved. 8 months later, started chirping again, squealing louder when it rained. This time it turned out that the alternator was the cause. Replaced and all is good now.&nbsp;

opnspaces · Answer

If it was mine I would pull the belts and run some 600 grit paper through all the pulleys to knock down any glazing. Since it was squeaking I would also put a new belt on after the sanding.

krusty · Answer

When I replace a noisy belt, I like to spray off the pulleys with brake clean in case somebody has tried to cure the noise with some type of lubricant

latner · Answer

Might be hard to see, but are all pulleys aligned?

npena5 · Answer

Any lucky finding the source? I am dealing with similar stuff with my 2015 silverado 2500 6.0. Replaced belt, tensioner, and pulley. Chirping went away for about 3 weeks but is now returned with the humid weather/rain. It only last for a few seconds and goes away but I have a feeling it will start lasting longer. I tried testing the alternator with a multimeter and tried checking alignment with a laser. Everything seems fine.

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belt chirp/squeak

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