Motor vehicle heating, ventilating and air conditioning system with combined mode/temperature door

A motor vehicle passenger compartment heating, ventilating and air conditioning system comprising an air duct having an inlet at one end and terminating at another end in an end portion having a defroster outlet, air conditioning outlet and heater outlet, said outlets being angularly spaced from each other, said air duct having parallel arranged first and second passages with large and small cross-sectional flow areas, respectively, for connecting said outlets to said inlet, an evaporator mounted in said first passage, a heater mounted in said second passage, and singular rotary mode/temperature door means mounted in said end portion for (1) fully opening said first passage and air conditioning outlet while closing said defroster outlet, heater outlet and second outlet to effect within said door means a first mode providing full cold operation, (2) fully opening said first passage while partially opening said air conditioning outlet and second passage and closing said defroster outlet and heater outlet to effect within said door means a second mode providing mixed hot and cold operation (3) fully opening said first passage while partially opening said second passage, air conditioning outlet and heater outlet and closing said defroster outlet to effect within said door means a third mode providing bi-level mixed hot and cold operation, (4) fully opening said second passage and heater outlet while closing said first passage and air conditioning outlet and partially opening said defroster outlet to effect within said door means a fourth mode providing a full hot heater/defroster operation, and (5) fully opening said second passage while partially opening said defroster outlet and heater outlet and closing said first passage and air conditioning outlet to effect within said door means a fifth mode providing full hot heater and defroster bleed operation.

A motor vehicle passenger compartment heating, ventilating and air conditioning system comprising an air duct having an inlet at one end and terminating at another end in a cylindrical portion having a defroster outlet, air conditioning outlet and heater outlet, said outlets being angularly spaced from each other with said air conditioning outlet intermediate said other outlets, said air duct having parallel arranged first and second passages for connecting said outlets to said inlet, an evaporator mounted in said first passage, a heater mounted in said second passage, and singular rotary mode/temperature door means mounted in said cylindrical duct portion for (1) fully opening said first passage and air conditioning outlet while closing said defroster outlet, heater outlet and second passage to effect within said door means a first mode providing full cold operation, (2) fully opening said first passage while partially opening said air conditioning outlet and second passage, and closing said defroster outlet and heater outlet to effect within said door means a second mode providing mixed hot and cold operation, (3) fully opening said first passage while partially opening said second passage, air conditioning outlet and heater outlet and closing said defroster outlet to effect within said door means a third mode providing bi-level mixed hot and cold operation, (4) fully opening said second passage and heater outlet while closing said first passage and air conditioning outlet and partially opening said defroster outlet to effect within said door means a fourth mode providing full hot heater/defroster operation, and (5) fully opening said second passage while partially opening said defroster outlet and heater outlet and closing said first passage and air conditioning outlet to effect within said door means a fifth mode providing full hot heater and defroster bleed operation.