Refrigerant Leak Testing
WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
General Motors vehicles are now manufactured with fluorescent dye installed directly into the A/C system.
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 Halogen Leak Detector, even though the A/C system contains fluorescent dye. See Special Tools and Equipment .
The only time that adding additional fluorescent dye is required is after flushing the A/C system.