| 摘要 |
PROBLEM TO BE SOLVED: To appropriately cool an engine part and suction air corresponding to an atmosphere temperature and an engine load. SOLUTION: The system has a module type radiator system having a partition in a tank of radiator. This partition forms respective radiator portion 20, 70 and has an orifice 88 for imparting a cross over function between these radiators 20, 70. In the case where an engine temperature is low, a thermostat 46 is closed to mainly circulate a coolant in an engine 12 and a pressure at a downstream side of the thermostat 46 is reduced. Thereby, a circulation is realized such that the coolant is returned from after cooler circuits 60, 80 to them through a first cross over 64, a first radiator 20 and a second cross over 76 in turn. In the case where the engine temperature is high, the thermostat 46 is opened to make a pressure between the two circuits uniform and a coolant flows to these circuits.
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