This V-belt transmits rotational force from the engine crankshaft to the fan hub, driving the cooling fan that pulls air across the radiator and engine block. It sits in the drive system, routed around the crankshaft pulley, fan pulley, and any idler or tensioner pulleys in the circuit. A slipping or worn belt reduces fan speed, leading to elevated coolant temperatures and reduced airflow through the heat exchanger. The original manufacturer's belt profile matches the pulley groove geometry of the host machine, maintaining correct contact area and tension retention without requiring shimming or adapter pulleys. On replacement, verify the belt routing diagram and adjust the tensioner to the specified deflection.