The water pump is a crucial component in a car's cooling system. Its primary function is to circulate coolant through the engine and radiator, preventing overheating. The pump is typically driven by a belt connected to the engine's crankshaft. As the engine runs, the water pump draws coolant from the radiator, pumps it through the engine to absorb heat, and then returns it to the radiator for cooling. A malfunctioning water pump can lead to engine overheating and serious damage. Regular maintenance and timely replacement of the water pump can ensure optimal engine performance and longevity.