Fluorescent Dye Leak Detection
- Inject the dye into the low side port using the J 46297 or equivalent.
- Dye can also be added to any component directly if removed.
General Motors vehicles are now manufactured with fluorescent dye installed directly into the A/C system. The only time that adding additional fluorescent dye is required is after flushing 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 The sealing cap is the primary seal for the service ports.
Follow the instructions supplied with the J 42220.
NOTETo 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.
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. Halogen leak detectors are sensitive to many solvents and cleaners, including windshield washer fluid and adhesives.
- 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 .