Air Conditioning System: Precaution

WARNING: This page is about a different car, the 2008 Scion xB. 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
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.
  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.
Fig 2: Precaution For Skin Or Eye Contact With Liquid Refrigerant
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NEVER HEAT CONTAINER OR EXPOSE THE CONTAINER TO OPEN FLAME
BE CAREFUL NOT TO DROP CONTAINER OR APPLY PHYSICAL SHOCKS TO IT
DO NOT OPERATE COMPRESSOR WITHOUT ENOUGH REFRIGERANT IN REFRIGERANT SYSTEM
If there is not enough refrigerant in the A/C system, the oil lubrication will be insufficient and the compressor may be damaged.

Necessary care should be taken to avoid this.
DO NOT OPEN HIGH PRESSURE MANIFOLD VALVE WHILE COMPRESSOR IS OPERATING
1. Open and close only the low pressure valve.
  If the high pressure valve is opened, refrigerant flows in the reverse direction causing the charging cylinder to rupture.
  
  Fig 3: Identifying High And Low Pressure Manifold Valve
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
BE CAREFUL NOT TO OVERCHARGE SYSTEM WITH REFRIGERANT
If the 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
CAUTION: Doing so may damage the inside of the compressor because the compressor parts always move regardless of whether the A/C system is turned on or off.