| 摘要 |
PROBLEM TO BE SOLVED: To provide an internal combustion engine cooling device capable of determining whether a failure has occurred in a flow control valve controlling the supply of cooling water into a cylinder block.SOLUTION: An internal combustion engine cooling device comprises: a circulation passage 16 that is a passage for circulating cooling water in the internal combustion engine 10 and includes a first cooling water passage 16a cooling a cylinder head 14 and a second cooling water passage 16b cooling a cylinder block 12 and the cylinder head 14; and a thermostat 20 controlling the supply of the cooling water to the second cooling water passage 16b. Under circumstances where the closure of the thermostat 20 is scheduled, when a difference between a cylinder block water temperature and an engine outlet water temperature is equal to or lower than a predetermined determination value, it is determined that a failure in which the thermostat 20 is not normally closed has occurred. |
