How to change the tensioner pulley

go to autozone and rent the serpentine belt tool,part# 27115.it cost $30.00 to rent it.you get all your money back when you return it.you need this to release the tension on the belt to remove the belt.only one bolt in tensioner pulley.remove the bolt,remove the pulley.install new pulley,bolt,tighten.now would be a good time to check your belt.if not changed in a long time,or cracks in belt,replace it to.pay attention to the way belt is routed.if replacing belt,take the old one with you,there are 2 different ones.one with a/c,one without a/c.if no belt routing diagram,get autozone to print diagram out for you.