Vehicle air conditioner having diffuse ventilation mode

In a vehicle air conditioner controls the air-conditioning, a face duct 4 is branched off to lead the conditioned air to a diffuse ventilation blow-out port 6. A mode door 7 is activated to select a blow-out mode from a face mode, a diffuse ventilation mode and a face-diffuse mode based on a target blowing temperature TAO. The face mode is preferably selected when the local cooling is required. The face-diffuse mode is preferably selected when the rapid cooling is required. The diffuse ventilation mode is preferably selected when the moderate cooling is required.