Usually it is this pulley on the Alternator that makes noise:
The overruning clutch pulley on the Caliber is refered to as a Litens OAD. OAD stands for Overrunning Alternator Decoupler. It is a wearable item and will need replacing on every vehicle that it is on. The part is available in the aftermarket and can be replaced without replacing the entire alternator. For more info you can go to www.decouplerpulley.com
. One thing to remember is to never replace with solid pulley. THe belt tensioner will go nuts and there will be major issues.
ps. This Litens OAD has been on the Dodge Caravan (2001-2005) for many years. Mechanics are just now learning about the OAD and that it CAN be replaced by itself to $ave the vehicle owner money.