Belt Adjustment
WARNING: This page is about a different car, the 2003 Mercury Mountaineer, 2003 Lincoln Aviator, 2003 Ford Explorer Sport Trac, 2003 Ford Explorer Sport, and 2003 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
Belt tension is set by automatic belt tensioners and is not adjustable. Tension is within specification if the tensioner is within the indicator markings.