Release belt tension and remove belt. You will need a 1/2" drive breaker bar or ratchet to release tensioner. Be sure to note routing of belt on pulleys for reinstallation in case the diagram decal is gone. Remove the mounting bolt and remove tensioner. Note that there is a locating pin on the back that must engage the hole in the mounting bracket. Line up the locating pin on the new tensioner with the hole in the mounting bracket. Install the tensioner mounting bolt, making sure the locating pin stays lined up. Torque to specs and reinstall the belt according to the diagram on the hood or fan shroud. Be sure all grooves of belt line up in pulleys to avoid damage. If it is just the pulley or bearing that's bad, you can sometimes purchase these separately and use the old tensioner assembly.
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