Air conditioning system for automobile and door assembly thereof

Disclosed is an air conditioning system for an automobile comprising an intake unit (IU) having a blower fan (2) and a motor (M) therefor; and a temperature adjusting control unit (RU). The intake unit and the temperature adjusting control unit being connected with each other by an air supplying connection part (C), such that their leftward and rightward positions can be selected. The temperature adjusting control unit having an evaporator (3) and a heater (4) located in an air flowing path defined in a housing (H) which occupies a single space.