General Motors vehicles are now manufactured with fluorescent dye installed directly into the air conditioning (A/C) system.
Prior to recovering or charging the refrigerant system, you must use an A/C refrigerant analyzer to identify gas samples taken directly from the refrigeration system or storage containers.
- Follow the instructions included with the refrigerant analyzer to obtain the sample for testing.
The analyzer will display one of the following :
- A green "PASS" light emitting diode (LED) will light if the purity of the R-134, R-12 is better than 98% by weight.
- A red "FAIL" LED will light if the purity of the gases does not meet the 98% purity standard.
- A red "FAIL" LED and "HYDROCARBON" light will illuminate and a horn will sound if a hydrocarbon is detected above 5%. This will alert the user of potential hazards.
- If contaminated refrigerant is detected, DO NOT recover the refrigerant into your recovery/recycling equipment.
Contaminated Refrigerant Handling
If contaminated refrigerant is detected, DO NOT recover the refrigerant into R-134a recovery/recycling equipment.
A new suction accumulator or receiver/drier must be installed as directed by the air conditioning system flushing procedure.
- Recover the contaminated refrigerant using suitable recovery-only equipment designed for capturing and storing contaminated refrigerant only.
- If this equipment is not available, contact an A/C service facility in your area with the correct equipment to carry out this service.
- Determine and correct the cause of the customers initial concern.
- Flush the air conditioning system.
- Dispose of the contaminated refrigerant in accordance with all federal, state and local regulations.