This multi-ribbed belt transmits power from the engine crankshaft to the ancillary drives, such as the alternator, water pump, and cooling fan. It is a 4PK profile, meaning it has four ribs on the inner face that engage with matching pulleys to prevent slip under load. The belt is constructed with a reinforced rubber compound to resist tension and heat buildup during continuous operation. A worn belt will produce a squealing noise under acceleration or load, and can cause the driven components to operate below their required speed, leading to reduced cooling or charging output. This belt is manufactured by Bosch to match the original profile and tension characteristics of the assembly it replaces. On installation, ensure the belt is tensioned to the manufacturer's specification and that the pulleys are aligned to prevent edge wear.