The serpentine belt tensioner applies pressure to the serpentine belt, maintaining optimal tension to drive the accessories like the alternator and A/C compressor. The service life of the belt tensioner is the same as the belt itself, so they should always be replaced together. A worn tensioner inhibits the accessories from spinning properly, leading to premature wear and noise. Your vehicle manufacturer has a recommended mileage interval for serpentine belt replacement. A complete accessory&hellipÂ» READ MORE
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