Temperature control device for engine

A temperature control device for an engine, comprising:

• an air heater configured to heat air introduced into a throttle valve by a flow of engine cooling water;
• and
• a valve apparatus configured to cut off the flow of the engine cooling water passing through the air heater at a set temperature range or more, without being supplied with a separate control signal from a controller so as to cut off the flow of the engine cooling water independently from the controller,
• wherein the valve apparatus comprises a thermostat which cuts off cooling water discharged from the engine through an engine passage from flowing in a heat radiation passage toward a radiator when a temperature of the cooling water is less than the set temperature range and cuts off the cooling water from the engine passage from flowing through a bypass passage for directly supplying the cooling water to a water pump while bypassing the radiator when the temperature of the cooling water exceeds the set temperature range, and
• wherein the thermostat which is the valve apparatus is configured to cut off a circulation passage through which cooling water passing through the air heater is connected to the bypass passage when a second valve cuts off the bypass passage through which the cooling water is directly supplied to the water pump when the temperature of the cooling water exceeds the set temperature range.