Patent ID: 7237511

Claim:
A cooling device of an engine, comprising: a radiator passage in which coolant is circulated by a water pump between a water jacket of the engine and a radiator; a thermostat provided in the radiator passage and operative to open the radiator passage when an engine temperature is a specified passage-opening temperature or higher, and to close the radiator passage when the engine temperature is lower than the specified passage-opening temperature; a heater passage in which the coolant is circulated between the water jacket and a heater unit for heating of a vehicle cabin; and a flow adjusting device operative to adjust a flow amount of the coolant that flows in the water jacket according to the engine temperature at an engine start, wherein said flow adjusting device is configured so as to adjust the flow amount of the coolant flowing in the water jacket to be a normal amount when the engine temperature is in an extremely-cold condition where the engine temperature is lower than the specified passage-opening temperature and lower than an extremely-cold standard temperature, to be zero or smaller than the normal amount when the engine is in a mild-cold condition where the engine temperature is or higher than the extremely-cold standard temperature and lower than a mild-cold standard temperature that is lower than the specified passage-opening temperature, and to be the normal amount when the engine is in a warm condition where the engine temperature is or higher than the mild-cold standard temperature, and said heater passage is configured so as to be opened at least when the engine is in the extremely-cold condition.