The Mazda 6 Water Pump ensures that the engine maintains a safe temperature by forcing coolant through the block and radiator. The Water Pump is mounted close to the front of the engine; it has a shaft mounted on closed bearings, an outer pulley, and an inner impeller, with the propulsive force being the flow of coolant into the water jacket. The coolant is then pumped into the thermostat and radiator, where the heat is dissipated out of the system. A Water Pump on a Mazda is driven by a belt that drives the crankshaft, giving a simple system where the pump speed is regulated by engine speed at all times, with more modern models in certain trims using an electric motor to enable the pump flow to be adjusted to specific levels even when the engine is idle. The pumps made previously were of cast iron, but almost all modern Mazda cooling fittings are of lighter aluminum castings that resist corrosion better. All Mazda Water Pumps are based on the same basic concepts, no matter what style of drive they are operating under, and it is necessary to ensure that the coolant moves fast enough to prevent the formation of hot spots. The tight seal ensures that there is no leakage of coolant to the bearings, no matter how much pressure is generated, which would cause the bearing to produce noise or to overheat. Dripping coolant, grinding in the pulley section, or a rising temperature indicator let the driver know that the Water Pump is not functioning properly and needs immediate service to save the engine. Those common principles are not altered in all the generations of the 6.
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