Abstract: There is disclosed a vehicle air conditioning device which is capable of judging, as early as possible, refrigerant shortage, for example, due to leakage of refrigerant with elapse of time, and protecting a compressor. The vehicle air conditioning device includes a compressor 2, a radiator 4, an outdoor expansion valve 6, and a heat absorber 9. A control device possesses normal time data indicating a relation between a suction refrigerant temperature Ts and a discharge refrigerant temperature Td of the compressor when a refrigerant circuit R is charged with a sufficient amount of the refrigerant. The control device calculates, from the normal time data, a discharge refrigerant temperature estimated value Tdst at normal time on the basis of the current suction refrigerant temperature Ts, and compares the value and the current discharge refrigerant temperature Td, thereby judging refrigerant shortage of the refrigerant circuit.

Abstract: In an air-conditioning apparatus of a so-called heat pump system, wasteful power consumption to be generated when an auxiliary heating means is disposed on an air upstream side of a radiator is decreased, and comfortable heating of a vehicle interior is also achieved. The air-conditioning apparatus includes an electric heater 57 disposed on an upstream side of air flowing through an air flow passage 3 to a radiator 4, and a controller executes a cooperative operation of heating air to be supplied to the vehicle interior by the electric heater 57 and the radiator 4, and stops a compressor 2 on the basis of establishment of a condition that an inlet refrigerant temperature Tcxin of the radiator is lower than an outlet refrigerant temperature TCI of the radiator (Tcxin<TCI).