The water pump is a crucial component of a car's cooling system. Its primary function is to circulate coolant through the engine, radiator, and heater core, maintaining optimal operating temperatures. The pump is usually driven by the engine's crankshaft via a belt. A malfunctioning water pump can lead to overheating, which may cause severe engine damage. Signs of a failing water pump include coolant leaks, unusual noises, and overheating engines. Regular maintenance, including checking the coolant level and inspecting the pump for wear, can help ensure its longevity and the overall health of the vehicle’s engine.