Air conditiong device with multiple evaporators for a motor vehicle

An expansion valve's (10) opening combines with a compressor's (1) outlet. A second vaporizer (11) operates as a heat pump. A refrigerant pipe (12) forms a main circuit with a refrigerant radiator (2) as a refrigerant liquefier downstream to the compressor, along with an expansion device controlling the flow of refrigerant, a first vaporizer (5) and a collector (7) for liquid. An independent claim is also included for a coolant circuit for a motor vehicle's air-conditioning unit.