COOLING DEVICE OF INTERNAL COMBUSTION ENGINE

PURPOSE: To prevent lowering of output of an internal combustion engine caused by rising of intake air temperature at the time of warming-up in a cooling device of an internal combustion engine, which is adapted to prevent icing of a throttle valve at the time of cold by circulating cooling water in the periphery of a throttle body. CONSTITUTION: A branch path 20 is disposed in such a manner as to communicate with the main cooling passage 14 for introducing cooling water which flows out of a water jacket of an internal combustion engine into a radiator 22 or a thermostat 24. A water valve 26 which opens a valve only when the operating condition of a compartment heater is established is connected to the branch path 20. A heater passage 28 having a heater core functioning as a heat source of the compartment heater is connected to the downstream of the water valve 26. A throttle body passage 32 for introducing some of cooling water which flows through a heater passage 28 to the periphery of a throttle body 34 is provided on the downstream of the water valve 26.