| 摘要 |
PURPOSE:To reduce the generation of noise during maximum cooling, to decrease a consumption power, and to uniformize a blow off temperature, by a method wherein, separately from a heater core bypass passage, a draft passage, through which a vaporizer and an upper supply opening are intercommunicated, and an opening and closing means for the bypass passage are provided. CONSTITUTION:During maximum cooling, a heater bypass door 6 is opened, and a heater core 4 is closed by means of an air mix door 8. A vent supply opening 1c is communicated to an upper blow off duct 1b through a vent diff door 9 and a diff bypass door 10. A floor supply opening 1e is closed by means of a floor door 11. Thus, cold air passing a vaporizer 3 is all blown off in a car room through an upper supply opening 1b. This constitution prevents production of discontinuous sensation of control of an airflow, enables reduction of draft resistance, reduction of the generation of noise, reduction of a consumption power, and uniformization of a blow off temperature. |
