Air Conditioning System: Precaution

WARNING: This page is about a different car, the 2004 Lexus RX 330. However, it is still accessible from the selected car via links, so may be relevant.

DO NOT HANDLE REFRIGERANT IN AN ENCLOSED AREA OR NEAR AN OPEN FLAME
ALWAYS WEAR EYE PROTECTION

Fig 1: Wearing Eye Protection
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
BE CAREFUL NOT TO GET LIQUID REFRIGERANT IN YOUR EYES OR ON YOUR SKIN
If liquid refrigerant gets in your eyes or on your skin.
1. Wash the area with lots of cold water.
  
  Fig 2: Liquid Refrigerant Precaution
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  CAUTION: Do not rub your eyes or skin.
2. Apply clean petroleum jelly to the skin.
3. Go immediately to a hospital or see a physician for professional treatment.
NEVER HEAT CONTAINER OR EXPOSE IT TO NAKED FLAME
BE CAREFUL NOT TO DROP CONTAINER AND NOT TO APPLY PHYSICAL SHOCKS TO IT
DO NOT OPERATE COMPRESSOR WITHOUT ENOUGH REFRIGERANT IN REFRIGERANT SYSTEM
If there is not enough refrigerant in the refrigerant system, oil lubrication will be insufficient and compressor may burnout may occur, so take care to avoid this, necessary care should be taken.
DO NOT OPEN HIGH PRESSURE MANIFOLD VALVE WHILE COMPRESSOR IS OPERATING
Open and close the only low pressure valve. If the high pressure valves are opened, refrigerant flows in the reverse direction and cause the charging cylinder to rupture.

Fig 3: High Pressure Manifold Valve Precaution

BE CAREFUL NOT TO OVERCHARGE SYSTEM WITH REFRIGERANT
If refrigerant is overcharged, it causes problems such as insufficient cooling, poor fuel economy, engine overheating, etc.
DO NOT OPERATE ENGINE AND COMPRESSOR WITH NO REFRIGERANT IS FILLED
CAUTION: This may damage the inside of the compressor because the compressor parts always moves regardless of whether the A/C system is turned on or off.