squeaky sound

i have a squeaky sound coming from my alternater belt..the alternater belt runs from the ac and the main under drive pully as well..i have a light weight under drive pully for about a year now..when i got that i also got a new belt for it.right now the belt still looks fine,so i dont know why it's making that sound..any ideas???

did you replace the tensioner when you replaced the belt???? i bet the tensioner is what is making the squeaky noise..

did you replace the tensioner when you replaced the belt???? i bet the tensioner is what is making the squeaky noise..

were is the tensioner located at?? how much does it cost?? and were can i buy it at??

Before you go buying a manual tensioner for no reason:

- Try tightening the tensioner on the belt. If the sound goes away, the belt is just stretched from age, and will probably need to be replaced soon.

If the sound remains after tightening:

- Try taking off the belt and spinning each pulley individually. They should spin smooth, quietly, and relatively resistance-free. Also try to wiggle the pulley, it shouldn't wiggle. If it does wiggle or spin roughly, that part needs to be replaced.

If there are no sounds or looseness from any of the pulleys, and tightening the tensioner doesn't make the sound go away then you probably need a new belt.