| 摘要 |
PROBLEM TO BE SOLVED: To achieve rapid cooling and heating, and in particular, excellent heating capability. SOLUTION: An oil cooler 40 for cooling engine oil is provided in a cooling- water bypass flow passage b2. A heater-core bypass flow passage b4 is connected in parallel with a heater core 11. An auxiliary heat exchanger 12 is provided for conducting heat exchange between a heat-exchange medium flowing in a heat-exchange-medium flow passage a and engine cooling water flowing in the heater-core bypass flow passage b4.
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