The water pump pulley is a component of the engine cooling system in a vehicle. Its primary function is to transfer the rotational energy from the engine's crankshaft to the water pump, which circulates coolant throughout the engine to regulate its temperature.

The water pump pulley is typically connected to the crankshaft pulley by a belt, and as the crankshaft rotates, the belt transfers this motion to the water pump pulley. The water pump pulley then rotates the water pump shaft, which drives the impeller inside the water pump.

As the impeller rotates, it draws coolant from the engine block and pushes it through the radiator, where it is cooled before returning to the engine. This constant circulation of coolant helps regulate the temperature of the engine and prevents it from overheating.

In summary, the function of the water pump pulley is to transfer rotational energy from the engine's crankshaft to the water pump, which is an essential component of the engine cooling system that helps maintain the engine's temperature within safe operating limits.

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