i would go to a auto parts store and buy a serpentine belt tensioner tool. this isn't an easy task. i would suggest having another person to help you. also make sure you have a diagram of how the belt goes.
you do not adjust tension on a serpentine belt the tension is automatcally adjusted if the belt is loose, replace the belt SOME TIMES THE TENSIONER CAN BE WEEK ALSO.
You can try this video guide on repairing the serpentine belt.
To replace the serpentine belt on a 2002 Ford E350 van, first, locate the belt routing diagram, usually found under the hood. Use a wrench or a serpentine belt tool to relieve tension on the tensioner pulley, then slide the old belt off. Position the new belt according to the routing diagram, ensuring it's seated properly on all pulleys. Finally, release the tensioner to secure the belt in place and double-check the alignment before starting the engine.
MORE INFORMATION NEEDEDWhat type of engine do you have? Number of cylinders, and Liters? 1998 ford e 150 van 8 cylinder 4.6lneed to find out the serpentine belt configuration
if it is a belt squeal, check and replace the serpentine belt and or the tensioner.
Tension is automatic. There is no adjustment.
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To change the belt tensioner pulley on a 1997 Ford Aerostar van, first, disconnect the negative battery terminal for safety. Then, locate the serpentine belt and use a wrench to relieve tension on the tensioner pulley, allowing you to remove the belt. Next, unbolt the old tensioner pulley from the tensioner assembly and replace it with the new pulley. Finally, reattach the serpentine belt and reconnect the battery terminal.
See "Related Questions" below for a discussion regarding the serpentine belt tensioner and pulley. Pretty comprehensive coverage.
should have spring loaded tensioner nonadjustable
autozone.com has pictures of the routing of the belt - you have to create a account which is free and there's pics after putting in your exact vehicle. You wont find routing pics in the haynes manuals which is dumb.
To replace the serpentine belt on a 1991 GMC van, first, ensure the engine is off and cool. Locate the serpentine belt routing diagram, usually found on a sticker under the hood. Use a wrench or ratchet to loosen the tensioner pulley, then slide the old belt off the pulleys. Install the new belt according to the routing diagram, ensuring it is properly seated on all pulleys, and then release the tensioner to secure the belt in place.