2001 windstar

[wiswind]

One test that you can do....but only do it for a moment.
I would have a person to start the engine if you want to be outside the vehicle to see.....
Or you can start it, listen for a few seconds and shut it down, without exiting the driver's seat.

Release the serpentine belt........and start the engine for only a couple seconds.

If no noise, it is likely of the many things driven by the serpentine belt.

If you still get the sounds, then it is not one of the things driven by the serpentine belt.

If it is something driven by the serpentine belt......don't forget the 2 idler pulleys, which can become noisy. I have been down that road. I had one that was fine when spun by hand, but load it up and run it, it was a whole different story.
There is 1 pully on the tensioner and one that is mounted to the front of the engine.
It is the bearings that went on mine (both eventually went).

Again, you don't want to run the engine for any length of time with the serpentine belt off as you have no water flow to cool the engine.