•  The PCM controls the coolant switching valve and the electric thermostat according to the vehicle conditions and the engine coolant temperature.

•  By blocking each water passage before the engine warms up, and suppressing heat radiation, the temperature of the internal wall of the cylinder is quickly increased to improve fuel economy.

•  There are 3 engine coolant passages to switch the engine coolant flow.

•  The target engine coolant temperature and the target engine coolant flow volume are set based on the vehicle driving conditions (engine speed, charging efficiency, and vehicle speed) and the engine coolant temperature input value, and then the coolant switching valve and the electric thermostat are controlled so that the set values are achieved.

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