The following tools may be required
Fluorescent Dye Leak Detection
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:
Follow the instructions supplied with the J 42220.
To prevent false diagnosis in the future, thoroughly clean the residual dye from any area where leaks were found. Use a rag and the approved fluorescent dye cleaner J 43872.
Only use dyes approved for use with General Motors vehicles. Not all of the fluorescent dyes are compatible with PAG oil. Some types of dye decrease the oil viscosity or may chemically react with the oil. To put the dye into the A/C circuit:
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.
To prevent false diagnosis, thoroughly clean any residual dye from the service port with a rag and the approved fluorescent dye cleaner J 43872.Halogen Leak Detector
Ensure that the vehicle has at least 1 lb. (0.45 kg) of refrigerant in the A/C refrigeration system in order to perform a leak test. Refer to Refrigerant Recovery and Recharging the A/C system procedure in this section.
Halogen leak detectors are sensitive to the following:
Clean and dry all surfaces in order to prevent a false warning. Liquids will damage the 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.
Follow the instructions supplied with the J-39400-A.Refrigerant Leak Testing
The fluorescent dye mixes and flows with the PAG oil throughout the refrigerant system.
Verifying some passive leaks may require using the J-39400-A, even though the A/C system contains fluorescent dye.
The only time that adding additional fluorescent dye is required is after flushing the A/C system.