WARNING: This page is about a different car, the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.
Install a 3/8 inch drive wrench on the drive belt tensioner arm and rotate the arm counterclockwise.
Remove the drive belt.
Slowly release the tension on the drive belt tensioner arm.