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The cooling program in an engine has 5 elements: the radiator, the radiator cap, the hoses, the thermostat and the water pump. Because you can't physically inspect the impeller and inside of a water pump without removing the pump, the ideal way to know if it is functioning correctly is to visually inspect the coolant situation, test the coolant pH and protection levels, test drive the automobile to confirm standard operating temperature, and squeeze the upper radiator hose (careful - it will be hot) when the engine is at operating temperature to confirm coolant flow and pressure.
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