How do fit a fan belt to a 2.4 diesel transit?

To fit a fan belt to a 2.4 diesel Transit, first ensure the engine is off and cool. Locate the tensioner pulley and use a wrench to relieve tension on the belt. Remove the old belt and route the new one according to the belt diagram, ensuring it sits properly in the grooves of each pulley. Finally, release the tensioner to apply tension to the new belt and check for proper alignment before starting the engine.