Avoid breathing the A/C Refrigerant 134a (R-134a) and the lubricant vapor or the mist. Exposure may irritate the eyes, nose, and throat. Work in a well ventilated area. In order to remove R-134a from the A/C system, use service equipment that is certified to meet the requirements of SAE J 2210 (R-134a recycling equipment). If an accidental system discharge occurs, ventilate the work area before continuing service. Additional health and safety information may be obtained from the refrigerant and lubricant manufacturers.
For personal protection, goggles and gloves should be worn and a clean cloth wrapped around fittings, valves, and connections when doing work that includes opening the refrigerant system. If R-134a comes in contact with any part of the body severe frostbite and personal injury can result. The exposed area should be flushed immediately with cold water and prompt medical help should be obtained.
General Motors vehicles are now manufactured with fluorescent dye installed directly into the air conditioning (A/C) system.
Fluorescent dye will assist in locating any leaks in the A/C system. Leaks in the A/C system will be indicated in a light green or yellow color when using the leak detection lamp
Use the leak detection lamp in the following areas:
All fittings or connections that use seal washers or O-rings
All of the A/C components
The A/C compressor shaft seal
The A/C hoses and pressure switches
The HVAC module drain tube, if the evaporator core is suspected of leaking
The service port sealing caps
To prevent false diagnosis in the future, thoroughly clean the residual dye from any area where leaks were found. Use an approved A/C dye cleaner.
R-134A leak detection dye requires time to work. Depending upon the leak rate, a leak may not become visible for between 15 minutes and 7 days.
Check the system with an approved halogen leak detector. Ensure that the vehicle has at least 0.45 kg (1 lb) of refrigerant in the A/C refrigeration system in order to perform a leak test.
Follow the instructions supplied with the halogen leak detector.
Follow a continuous path in order to ensure that you will not miss any possible leaks. Test all areas of the system for leaks.
Clean and dry all surfaces in order to prevent a false warning. Liquids will damage the detector.
Halogen leak detectors are sensitive to the following items:
Windshield washing solutions
Many solvents and cleaners
Some adhesives used in the vehicle
Repair as needed.