ACDelco 12580828 Drive Belt Tensioner Assembly is a drive belt tensioner designed for Chevrolet Silverado and GMC Sierra pickup trucks. It maintains tension on the engine’s serpentine belt within the accessory drive system, helping to keep the alternator, power steering, and other belt-driven components operating reliably. This part is identified by the 12580828 number and serves as a replacement for a worn or failing belt tensioner in applicable Silverado and Sierra models.
