To rule out the belt, use small amount of silicone or belt dressing and shoot it under the belt as it runs, If the squeaks fades, then it is your belt, please wear eye protection when u do this. Also make sure your belttensioner is working properly and is not holding belt loose.......

After that ,you can actually do the same thing to the back of the pulleys you can reach, watch your fan, use small amount, sometimes underhood gunk gets wedged between pulley and mounting surface, but my guess is your belt, just replaced mine, it was chirping and really wasnt that worn but at one time I got coolant on it when I did my timing gears, that will kill these serpentines.

Goodluck

 

Im haveing the same problem with mine...

 

Same here. Replaced idler pulley. Sometimes only squeal at startup in morning then dissapear.

 

It might be the squirel gettin tired and askin for 93 octane... aka gaterade