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You don't tighten it. It has an idler pulley that keeps the proper tension. If this is an old belt and is loose, then it needs replacing. If you have installed a new belt and it is loose, then either you installed the wrong belt or the idler spring is weak and the idler needs replacing.

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Q: How do you tighten your serpentine belts on a 2001 Nissan Pathfinder?
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