An air conditioning system of a motor vehicle with a refrigeration circuit and a coolant circuit , wherein - the refrigeration circuit comprises a compressor , a refrigerant-coolant heat exchanger which can be operated as condenser/gas cooler for the heat exchange between the refrigerant and the coolant of the coolant circuit , as well as a first refrigerant-air heat exchanger for conditioning the intake air for the passenger compartment, wherein a first expansion device is located upstream with respect to the first refrigerant-air heat exchanger in flow direction of the refrigerant, - the coolant circuit comprises a conveying device , a first coolant-air heat exchanger for heating the intake air for the passenger compartment as well as the refrigerant-coolant heat exchanger , - the refrigeration circuit is formed with a second refrigerant-air heat exchanger for conditioning the intake air for the passenger compartment, wherein a second expansion device is located upstream with respect to the second refrigerant-air heat exchanger in flow direction of the refrigerant, - the coolant circuit is formed with a second coolant-air heat exchanger for heating the intake air for the passenger compartment, - the first expansion device and the first refrigerant-air heat exchanger are arranged within a first flow path of the refrigeration circuit , and the second expansion device and the second refrigerant-air heat exchanger are arranged within a second flow path of the refrigeration circuit , wherein the flow paths are arranged so as to enable throughflow parallel to one another, and - the first flow path with the first expansion device and with the first refrigerant-air heat exchanger and the second flow path with the second expansion device and with the second refrigerant-air heat exchanger are each formed so that they extend from a branch point to a first opening point , characterized in that an expansion device is formed downstream with respect to the first opening point in flow direction of the refrigerant. - the refrigeration circuit comprises a compressor , a refrigerant-coolant heat exchanger which can be operated as condenser/gas cooler for the heat exchange between the refrigerant and the coolant of the coolant circuit , as well as a first refrigerant-air heat exchanger for conditioning the intake air for the passenger compartment, wherein a first expansion device is located upstream with respect to the first refrigerant-air heat exchanger in flow direction of the refrigerant, - the coolant circuit comprises a conveying device , a first coolant-air heat exchanger for heating the intake air for the passenger compartment as well as the refrigerant-coolant heat exchanger , - the refrigeration circuit is formed with a second refrigerant-air heat exchanger for conditioning the intake air for the passenger compartment, wherein a second expansion device is located upstream with respect to the second refrigerant-air heat exchanger in flow direction of the refrigerant, - the coolant circuit is formed with a second coolant-air heat exchanger for heating the intake air for the passenger compartment, - the first expansion device and the first refrigerant-air heat exchanger are arranged within a first flow path of the refrigeration circuit , and the second expansion device and the second refrigerant-air heat exchanger are arranged within a second flow path of the refrigeration circuit , wherein the flow paths are arranged so as to enable throughflow parallel to one another, and - the first flow path with the first expansion device and with the first refrigerant-air heat exchanger and the second flow path with the second expansion device and with the second refrigerant-air heat exchanger are each formed so that they extend from a branch point to a first opening point , <EOS>