| 摘要 |
A short circuit duct 18, which branches at least part of air flowing through a cold air bypass passage 16 and causes a fan to suck it, is provided. According to this, part of cold air is taken out at a position as close as possible after an evaporator and is circulated again through a route as short as possible, whereby the discharged air temperature is further reduced. A low discharged air temperature can be attained quickly by efficiently returning the cold air immediately after the evaporator to the fan through the shortest route, which can be realized by providing an air introduction inlet 19 directly to an air conditioning case on the top surface of the existing cold air bypass passage 16 immediately after the evaporator 9 and using the short circuit duct 18 with small heat capacity after the air introduction inlet.
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