Belt Tension
WARNING: This page is about a different car, the 2003 Cadillac Seville, 2003 Cadillac DeVille, and 2003 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
Adjustment of serpentine belt is not necessary. Belt tension is maintained by spring-tensioned idler pulley (some equipped with belt wear indicator).