Past 2 days car has been making a squealing noise coming from the engine compartment. On again off again noises. So I changed my belt tensioner, nothing changed. Driving home from work, then straight, solid squealing. Stopped, checked it out, belt was busted. How do you know which accessory is seized? It's a serpentine set up TPI. I did noticed at one moment to start it, it did not want to. Acted week, heard some squealing. The car will crank up.

 

Spin each by hand, if it's near locked up it should make a lot of noise or not free wheel very well. Also, just wiggle each pulley to make sure they don't have side to side or up/down movements.