COOLING SYSTEM OF INTERNAL COMBUSTION ENGINE

摘要

PROBLEM TO BE SOLVED: To lower temperature of cooling water flowing out from a head side flow path while maintaining heating performance as compared with a structure wherein cooling water is distributed to a head side flow path and a block side flow path.

SOLUTION: A first cooling water circuit 10 in which cooling water is circulated between a head side flow path 11 and a first radiator 12 and a second cooling water circuit 20 in which cooling water is circulated between a block side flow path 21 and a second radiator 22 are independently formed. A first and second route switching valves 32 and 33 for switching routes of the cooling water flowing into and flowing out from a heater core 31 are arranged. Thereby even when the temperature of the cooling water flowing out from the head side flow path 11 is lowered to a temperature which does not maintain heating performance, the cooling water flowing out from the block side flow path 21 is made to flow in the heater core 31 by the first and second route switching valves 32 and 33 and the temperature of the cooling water flowing out from the block side flow path 21 is made to be a temperature required for maintaining heating performance to maintain heating performance.

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