I sometimes hear a slight squealing noise when I shut the car off. I don't hear it often - mainly in the garage. I'd assume its because its not very loud and resonates off the walls.

Seems to come from the passenger's side, but its hard to tell as it only happens for about a second.

I'm assuming its the belt making noise as its coming to a stop. Could it be a loose pulley? Belt needs replacement? Anybody had this happen before?