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Refrigerant Leak Testing

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:

All air conditioning system repairs must be verified using electronic leak detection. Dye detection may take up 2 or 3 days to be reliable.

NOTE:

General Motors vehicles are now manufactured with fluorescent dye installed directly into the air conditioning system.

The fluorescent dye mixes and flows with the air conditioning oil throughout the refrigerant system.

Verifying some passive leaks may require using the GE-50078  leak detector, even though the air conditioning system contains fluorescent dye.

The only time that adding additional fluorescent dye is required, is after flushing the air conditioning system.

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