The invention relates to a vehicle air conditioning system with a refrigerant circuit (1), which has at least one evaporator (2), a refrigerant compressor (3), a refrigerant condenser (4), an expansion valve (5) associated with the evaporator (2) and at least one heat exchanger (7) provided for coupling with a coolant circuit (6) of a heat source with an associated expansion valve (8), which are connected by means of a refrigerant line (9). According to the invention, it is provided that a refrigerant container (10) connected to the refrigerant line (9) on the high-pressure side of the refrigerant compressor (3) is provided, which has a chamber (10.1) receiving refrigerant with a controllable volume and a control unit (11) is provided, by means of which the volume of the chamber (10.1) of the refrigerant container (10) is controlled as a function of operating parameters of the refrigerant circuit (1). According to an alternative solution according to the invention, a refrigerant container (10) connected to the refrigerant line (9) on the high-pressure side of the refrigerant compressor (3) via a branch line (9.2) is provided, furthermore a branch valve (13) is arranged in the branch line (9.2), and finally a control unit (11) for controlling the branch valve (13) is provided, such that as a function of operating parameters of the refrigerant circuit (1) refrigerant is drawn off into the refrigerant container (10).
