A belt tensioner is a spring-loaded idler pulley that ensures the serpentine belt stays routed on its pulleys at the proper tension. The tensioner is sealed with no lubrication point and has about the same service life as the belt itself, so it’s a good idea to plan on replacing them at the same time. The tensioner uses a spring to apply proper tension on the belt and this will weaken over time. Shop Advance for belt tensioners from trusted brands like Dayco, ACDelco, Gates and Motorcraft.
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Serpentine belts are a little tricky, but most vehicles feature a routing schematic underhood that shows the proper path the belt should take. When replacing the belt, it might be a good idea to replace the tensioner assembly as well.