This V-ribbed belt drives the engine-mounted accessories, including the alternator, water pump, and air-conditioning compressor. It transmits power from the crankshaft pulley to each driven pulley through its six longitudinal ribs, which engage with matching grooves on the pulleys. A worn or glazed belt slips under load, causing reduced alternator output, elevated coolant temperature, or loss of air-conditioning function. The belt is manufactured to the original cross-section profile and rib spacing, which ensures proper seating in the pulley grooves and correct tension retention over the service interval. When replacing, inspect the tensioner and idler pulleys for bearing wear, and verify that the belt tracks centrally on each pulley before tensioning.