The Mazda Protege Water Pump prevents frying of the engine by forcing coolant through the radiator and block to allow heat to dissipate to the air around. The Water Pump inside the engine forces coolant from the lower radiator hose through a network of jacket passages and the thermostat where it picks up heat of combustion and returns it to the radiator. The crankshaft is connected to a pulley that rotates a shaft on closed bearings, and the impeller on the opposite end pushes the fluid, although later Mazda models use an electric motor that uses a battery rather than a belt. In the Mazda family, the initial cast-iron housings were replaced by lightweight aluminum, although the mechanical and electric types have identical components, i.e., the rotating shaft, a tight seal to prevent the passage of coolant to the bearings, and an impeller that maintains a consistent flow. Electric style also is efficient in that it can be operated at variable speed and can keep circulating even when the engine is switched off as opposed to the belt-driven type which only turns as quickly as the engine. The fact that the pump is dripping colored coolant, making growling noises due to worn bearings, and is overheating caused by a broken impeller is a warning sign of a failing Water Pump. Authentic Mazda parts and regular checkups will ensure the gaskets are not ruined and the heads are not bent, ensuring that any Protege can keep it cool even when the driver has to drive a long distance or on a fast weekend trip.
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