The water pump is a vital component of a car's cooling system. Its primary function is to circulate coolant throughout the engine and radiator, preventing the engine from overheating. When the engine runs, the water pump pulls coolant from the radiator, pushes it through the engine, and returns it to the radiator for cooling. A properly functioning water pump ensures optimal engine performance and longevity. Common signs of a failing water pump include coolant leaks, unusual noises, and overheating. Regular maintenance and timely replacement of the water pump can prevent serious engine damage and costly repairs.