Vehicle air conditioner

A vehicle air conditioner comprising:

• a compressor to compress a refrigerant;
• an air flow passage through which air to be supplied to a vehicle interior flows;
• a heat absorber to let the refrigerant absorb heat, thereby cooling the air to be supplied from the air flow passage to the vehicle interior;
• a radiator disposed on a leeward side of the heat absorber to the flow of the air in the air flow passage to let the refrigerant radiate heat, thereby heating the air to be supplied from the air flow passage to the vehicle interior;
• an outdoor heat exchanger disposed outside the vehicle interior;
• an auxiliary heating device to let the air to be supplied from the air flow passage to the vehicle interior heat;
• and
• a control device,
• whereby the control device changes and executes a heating mode to let the refrigerant discharged from the compressor radiate heat in the radiator, decompress the refrigerant from which the heat has been radiated, and then let the refrigerant absorb heat in the outdoor heat exchanger, and a dehumidifying mode to let the refrigerant discharged from the compressor flow into the outdoor heat exchanger without flowing to the radiator to radiate heat therein, decompress the refrigerant from which the heat has been radiated, and then let the refrigerant absorb heat in the heat absorber and let the auxiliary heating device generate heat,
• wherein the control device shifts from the dehumidifying mode to the heating mode on the basis of a state in which a heat absorber suction air temperature Tevain that is a temperature of the air flowing into the heat absorber became lower than a target heat absorber temperature TEO that is a target value of a temperature Te of the heat absorber.