A water pump is vital to a car engine’s operation because it ensures the coolant keeps moving through the engine block, hoses and radiator, and maintains an optimum operating temperature. It is driven by a serpentine belt (aka accessory belt or auxiliary belt) from the crankshaft pulley.
A car’s water pump uses impeller blades and centrifugal force to move the cooled water into the car’s engine – or rather the water jacket that sits around the engine’s cylinders, which is where the combustion processes take place.
Once the water has flowed around the engine it is taken by hoses to the radiator, usually at the front of the car, where the water is cooled by the movement of air over the rad’s fins. It then exits the radiator and flows back into the water pump, where the process starts over.