There are several fluids running around your engine, and it's wise to know how to check their levels – even if you don't plan on changing them yourself...
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.