signal to drive the compressor 83 of the drive part 80 if the value of the pressure falls in status on s 190 the compressor 83 is driven to cool off the internal portion of the vehicle on the other hand if a driver presses on the second operational step switch 53 at the input part 10 of the driver 39 s manipulating panel to cool off an internal temperature of a vehicle more quickly s 120 the remote control part 60 transforms a relevant signal to a transmission signal and outputs same through the telecommunication cable the drive control part 70 outputs a drive signal to drive the evaporator fan 81 at the second operational level in response to an input of the signal as a result the evaporator fan 81 of the drive part 80 is driven at the second operational speed s 130 then if the driver turns on the air conditioner switch 51 s 160 the condenser 82 and compressor 83 are driven according to the status of the temperature sensor 56 and compressor pressure switch 90 if a driver presses on the third operational step switch 54 at the input part 10 of the driver 39 s manipulating panel to cool off an internal temperature of a vehicle more quickly s 140 the remote control part 60 transforms a relevant signal.