An idler pulley does no driving of its own. It just routes the belt and keeps it wrapped correctly around everything else, which means the only thing that fails is the bearing. When it goes you get a growl or chirp that is present at idle and changes with engine speed, and a seized idler will shred a belt in short order.

Pulley Details:

• Fits select Chrysler, Dodge, Jeep and Ram applications.
• Routes and supports the accessory drive belt.
• Sealed bearing construction.
• Genuine Mopar pulley. Inspect the belt and tensioner at the same time.