| 摘要 |
PURPOSE: An engine cooling system is provided to prevent the delay of warm-up time by preventing the forced open of a thermostat caused by the quick increase of the engine speed. CONSTITUTION: An engine cooling system comprises a thermostat(1) installed at a water path(2) of a radiator outlet, a bypass line(9) which is opened when the thermostat closes the water path of the radiator outlet and closed down when the thermostat opens the water path of the radiator outlet, and which guides a coolant to a water pump(11) with bypassing the radiator, an auxiliary bypass line(13) installed to be parallel with the bypass line and used as a path for supplementarily bypassing the coolant when the amount of coolant circulated through the bypass line is insufficient, and a check valve(16) installed in the auxiliary bypass line to be opened when difference of pressure is generated by the difference between the drain capacity of water pump and the passing capacity of water in the bypass pipe line.
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