Abstract: A climate control system for a vehicle is disclosed, in which an air flow direction flap 34 is arranged in use to operate in accordance with a control quotient so as to present an air flow in a range of orientations. The orientations are arranged in groups which comprise base orientation levels 1, 2, 3, 4 and at least one group of intermediate orientation levels 110, 111; 220, 222; 330, 333 between two neighbouring said base orientation levels 1, 2, 3, 4. In moving between said neighbouring base orientation levels 1, 2, 3, 4, said air flow directing flap 34 passes, at least transiently, through substantially each said intermediate orientation level 110, 111; 220, 222; 330, 333, whereby a variation in said presentation of said air flow A/F between said neighbouring base orientations appears to a user to be more gradual than would be a substantially stepped change if made directly therebetween.

Abstract: A climate control arrangement in which an existing automatic climate control system is adapted by an indicator quotient (TOA). A controller adjusts air duct distribution so that differential proportions of air flow can be presented to fixed air duct vents at respective height level HL, FL relative to an occupant of a motor vehicle. The indicator quotient (TAO) being determined by appropriate comparison of objective temperature, actual temperature and environmental temperature and is used by the controller for consistent occupant preferred air flow distribution between normal conditions and more extreme environmental conditions. Thus, occupant preferences for air flow distribution in normal Spring or Autumn type environmental conditions are adapted for more extreme Winter and Summer conditions without iterative and constant variation by that occupant.

Abstract: The heating feeling of an occupant is improved by setting the optimum time for a bi-level mode. A controller (7) switches an outlet mode to a FOOT/FACE mode (bi-level mode) if the water temperature (temperature of engine cooling water) rises to 45.degree. C. or higher in the course of warm-up control, and the necessary blowing temperature TAO is not lower than 100.degree. C. In the FOOT/FACE mode, the setting time (timer time) is variable depending on the outside air temperature and the presence/absence of solar radiation. Specifically, setting is done so that the lower the outside air temperature, the longer the timer time, and the higher the outside air temperature, the shorter the timer time. When solar radiation is present, the timer time is corrected in accordance with the time at which it is judged that solar radiation is present.