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Refrigerant Leak Testing

NOTE: General Motors vehicles are now manufactured with fluorescent dye installed directly into the air conditioning (A/C) system.

The fluorescent dye mixes and flows with the polyalkylene glycol (PAG) oil throughout the refrigerant system.

Verifying some passive leaks may require using a halogen leak detector, even though the A/C system contains fluorescent dye.

The only time adding additional fluorescent dye is required is after flushing the A/C system.

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