| 摘要 |
PROBLEM TO BE SOLVED: To reduce passage resistance, and improve cooling performance. SOLUTION: This vehicular airconditioning unit is provided with a mix door 23 for selectively making air flow to both of a mix passage 27 and a heater passage 29 and first, second and third mode doors 15, 17, 26. The third mode door 26 is communicated with a foot passage 19 from the heater passage 29 at full cool time of the mix door 23 in a first operation position (a), and also cuts off flow to the mix passage 27. At the same time, the third mode door is set, to the maximum passage area by retreating from a cold air passage in a vent mode. The air is made to flow to the foot passage 19 from the heater passage 29 in a foot mode at full hot time of the mix door 23 to flow to a differential port 9 via a foot port 13. A guide wall to the mix passage 27 from the heater passage 29 is formed at temperature adjusting time of the mix door 23 in a second operation position (b) to improve air mix performance.
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