Serpentine Belt Tensioner Most newer cars and trucks have a single serpentine belt on their engine. This belt transfers power, through pulleys, from the engines crankshaft to other accessories or pumps mounted on the engine. On many cars and trucks the serpentine belt will drive the water pump, the radiator cooling fan, the power steering pump, the generator or alternator, the air conditioning compressor and possibly even a supercharger or other auxiliary component. The belt must have the correct amount of tension to effectively drive all the components but not so much tension that the belt is in danger of breaking. The belt tensioner is responsible for generating the correct amount of tension. If your belt tensioner fails you will lose the benefits of many of the options. On many vehicles the water pump will stop turning but the engine will continue to run. This could lead to catastrophic failure of the engine.

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