bigdaddytowson

My 2000 C5 is making a squealing noise while running. Believe it's coming from alternator or pulley, sounds like tennis shoes on basketball court. Started a few weeks ago, went away quickly. Now it's full time, anyone else run into this issue or know how to fix it. Thanks in advance

helga203

Check your crack pulley. They start wobbling and they move causing belt squeal .common problem.

MikeG37

I put a line of paint across the front of my 03's factory balancer that could possibly give me a little warning of the rubber failing.

Robrote

A few things to check. Remove the belt and start the car and rule out the AC belt. While the belt is off, spin the idler pulley, the tensioner pulley for any sound. Also spin the water pump by hand. If you still can't find it, I can't help ya.

My Vette Life

if it's the original or old belt, just replace it. also could be from the moisture.
they sell belt conditioner too

pewter99

can only be a few things....belt(s)

tensioner serpentine or A/C

water pump

balancer

if its the balancer it will be obvious, wobbling, rubber bushing protruding

A/C is easy to eliminate by pulling serpentine belt and starting car

tensioner is likely

idler pulleys are least likely

water pump, maybe if high mileage...