Escalade, Suburban 1500 & 2500, Tahoe, Yukon, Yukon XL 1500 & 2500 (2006-2007), Yukon Denali and Yukon Denali XL (2005-2006)

Leak Testing


The following tools may be required

J 39400-A Halogen Leak Detector
J 41447 R-134a A/C Tracer Dye-Box of 24
J 42220 Universal 12 V Leak Detection Lamp
J 43872 Fluorescent Dye Cleaner
J 46297 A/C Dye Injector Kit
J 46297-12 Replacement Dye Cartridges

Fluorescent Dye Leak Detection

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:

J-41447 can be poured directly into a removed A/C component
J-46297-12 is injected into the low side port using J-46297

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 overcharge the A/C system with dye. Use only one 0.25 oz (7.39 ml) charge.

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

Do not operate the detector in a combustible atmosphere since its sensor operates at high temperatures or personal injury and/or damage to the equipment may result.

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:

Windshield washing solutions
Many solvents and cleaners
Some adhesives used in the vehicle

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.