Refrigeration circuit for use in a motor vehicle

The invention relates to a refrigeration circuit for use in a motor vehicle having a refrigerant compressor (8) on the output side to a pressure line (4) and whose input side is connected to a suction line (6), with at least one capacitor (10), (at least one controlled expansion valve, 14) (with at least one evaporator 16) and with at least one internal heat exchanger (12), wherein the controlled expansion valve (14) as a control variable, a temperature t