The water pump is a vital component of a car's cooling system. Its primary function is to circulate coolant throughout the engine, helping to regulate temperature and prevent overheating. The pump is typically driven by the engine's crankshaft via a belt or chain. When the engine runs, the water pump pushes coolant from the radiator into the engine block, absorbing heat. It then returns the heated coolant back to the radiator to be cooled. Regular maintenance of the water pump is essential, as a failure can lead to severe engine damage. Signs of a failing pump include leaks, unusual noises, and engine overheating.