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To remove your belt simply rotate the tensioner pulley creating slack in the belt and slide of the tensioner pulley. You can rotate the tensioner pulley with a tensioner pulley tool. If you don’t have one, you can find one here. Another , less easy way to do this is using a ratchet and socket that fits the center bolt on the pulley part of the tensioner.
After removing you serpentine belt, inspect all of the pulleys to make sure they are not damage and do not have any fluids on them. Re-route your belt according to the diagram posted here leaving the tensioner pulley for last and applying tension to the belt with your hand. Rotate the tensioner pulley and slide the belt over it.
Inspect your belt and all of the pulleys again and make sure the belt is aligned correctly on every pulley.