| 摘要 |
A cooling system for a vehicle comprises: a radiator and a water pump. The water pump comprises: a housing that forms a main body of the water pump and is mounted on an engine cylinder block that is provided with a plurality of coolant passageways; a pulley that is transfers turning force from an engine crankshaft to the water pump; a first impeller that forces coolant to circulate through an engine; a pump shaft that is rotatably mounted to the housing, one end of which is fixedly connected to the pulley, the other end of which is fixedly connected to the first impeller; a second impeller that forces coolant to circulate the engine and the radiator; and a second impeller rotating means that selectively rotates the second impeller according to a coolant temperature.
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