72MachOne99GT

It's not the tensioner pulley, and it's not the idler pulley either.

I bought a new pulley and tried replacing each of them, and both times it still squealed.

Could the air conditioning compressor be making the noise, or maybe the alternator?

It sounds JUST like when I had a bad bearing in the tensioner pulley and replaced it last spring, but now it's at it again, but it's not either of the aforementioned pulleys.

96GT226410

Idler pulleys have been known to squeek on the earlier models (NPI) usually when cold. While the engine is running use a flathead screwdriver and hold in with slight pressure on the belt. Make sure the squeek is coming from there. If it is, the squeek should stop when holding pressure on the side of the belt. After that you're going to have to listen real close or remove the belt and hand spin each pulley. Did you spill coolant on your belt when doing the work? Sometimes that'll make them squeek for a while.

945LSTANG

do the old screwdriver to the ear trick.

Brute03

one of mine is squealing toobut i can't pin-point which one, and it only does it in the morning when the car is cold, pretty annoying [:@]

btbw92091

one of mine started squeling last night after i went through some water and it wont stop

bt1288

Mine did the same thing and it turned out to be th alternator.

72MachOne99GT

the whole alternator, or jus the pully epar *im realy raly drunik*

im not sure if its a puly, o if this gu[y said it miht be the whole alternator?

its crazy, loud al the time, nmot just w hen i star tit

Modular_Madness96

its a bearring in your alternator rebuild or replace the alternator

vanquish

Did you try putting ATF or belt dressing on the belt?

72MachOne99GT

It sounds like its coming from something LOWER than the alternator.

I swear it sounds JUST like the tensioner pulley I replaced last spring, or the fall before that.

However I know that's not it since I changed out both pulleys that I thought it was.