Fluorescent Leak Detector

TOOLS REQUIRED
^ J 41447 R-134A A/C Tracer Dye
^ J 41459 R-134A A/C Tracer Dye Injector
^ J 42220 Universal 12 V Leak Detection Lamp
^ J 39400-A Halogen Leak Detector
^ J 43872 Fluorescent Dye Cleaner

IMPORTANT:
^ J 41447 is the only dye approved by General Motors. Not all of the R-134a dyes are compatible with PAG oil. Some dyes decrease the oil viscosity or chemically react with the oil.
^ PAG oil is water soluble. Condensation on the refrigerant lines or the evaporator core may wash the PAG oil. Condensation may leak dye off the line or off the core and out the condensation drain.
Condensation may make some leaks harder to find using the dye detector. Fluorescence at the drain opening indicates a core leak.
^ 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.
^ Do not double charge the system with dye. This may cause reliability problems. Use only the 0.25 ounce charge.
^ It is necessary to clean the area that a leak was detected after a repair so that residual dye does not indicate a false diagnosis in the future. Use a rag and the approved fluorescent dye cleaner J 43872 or equivalent to remove the excess dye.

If you know that the system has lost charge and you cannot find a leak with the J 39400-A, use a leak detection dye. This dye mixes with R-134a PAG oil. When you inspect the leak locations with a J 42220, the dye glows yellow/green.

The dye package contains a refrigerant leak detection notice sticker. Complete the sticker information and place the sticker near the charge label.