How do you replace belt tensioner on 2007 Dodge Caliber?

To replace the belt tensioner on a 2007 Dodge Caliber, first, disconnect the negative battery cable for safety. Then, remove the serpentine belt by using a wrench to rotate the tensioner pulley, releasing tension. Next, unbolt the old tensioner from its mount and install the new tensioner, ensuring it's secured properly. Finally, reinstall the serpentine belt and reconnect the battery cable.