How do you change a fan belt on a 1990 dodge ram van?

To change the fan belt on a 1990 Dodge Ram van, first, ensure the engine is off and cooled down. Locate the belt tensioner and use a wrench to relieve tension on the belt, then remove the old belt from the pulleys. Route the new belt according to the diagram usually found on the radiator support or in the owner's manual, and ensure it sits correctly in the grooves of the pulleys. Finally, release the tensioner to apply tension to the new belt and check for proper alignment before closing everything up.