| 摘要 |
A solenoid valve is arranged in a bypass passage of an engine cooling water circuit to selectively open and close the bypass passage. A temperature sensor is arranged in a vehicle cabin heating water circuit to monitor water temperature therein. A control unit is designed so that when the temperature sensor senses that the temperature of water in the vehicle cabin heating water circuit is below a predetermined level, the solenoid valve is closed, thereby increasing the flow rate of water in the vehicle cabin heating water circuit.
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