2001-2004 Mustang 3.8L
Mobile users click here to view diagram.
Removal and installation are fairly simple. To remove the old belt rotate the tensioner pulley counter clockwise releasing the tension on the belt and slide it off. Before you install the new serpentine belt be sure to inspect all the pulleys and make sure that they are free from debris and are nor damaged in any way.
route the belt around all the pulleys according to the diagram above leaving the tensioner pulley for last. Once the belt is around all the pulleys rotate the tensioner pulley counter clockwise and slip the belt over it. Inspect the belt and make sure it is aligned right on all the pulleys. If adjustments need to be made rotate the pulley just enough to release a little tension and make your adjustments.
Read about tensioner pulleys.
How to check your belt