1. Set the fan speed to the highest position.
2. Set the temperature to the extreme hot position.
3. Select the position.
4. The outside (fresh) air and air conditioning will be selected automatically.
If the air conditioning is not selected automatically press the corresponding button manually.
Rear vents
The vent can be adjusted by rotating the blade.
✽ NOTICE
If all the vents are closed, it may cause some noise. Always open 2 vents
or more. ...
Air Conditioner Refrigerant/Compressor Repair procedures
Refrigerant Recovery
When removing HFC-134a (R-134a) from the air conditioning
system, use only U.L.-listed service equipment certified to meet the
requirements of SAE J2210.
  ...