Water pumps ____________

A) Only work at idle and low speeds and are disengaged at higher speeds
B) Use engine oil as a lubricant and coolant
C) Are driven by the engine crankshaft or camshaft
D) Disengage during freezing weather to prevent radiator failure


C) Are driven by the engine crankshaft or camshaft

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Technician A says that an electric pump assists in delivering warm engine coolant to the passenger compartment when passenger heating is needed but the ICE is in idle stop mode. Technician B says that such auxiliary electrical devices are powered by the 12-volt system. Which technician is correct?

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