(Hybrid) AC Leak Dye Testing Information - keywords 2 2-mode a/c air condition hvac hp2 inop inoperative loss m99 mode refrigerant test two two-mode unwanted warm ultra violet

This PI was superceded to update model year information. Please discard PIT4669.

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Additional refrigerant dye for leak detection is not required on the 2 Mode Hybrid. The dye is added to the system at the assembly plant and will remain there unless removed during a flushing process, at which time the dye can only be replaced by replacing the AC accumulator. The new AC accumulator will contain a new dye tablet which will dissolve when the system is recharged.

Most Ultra Violet (UV) dyes (including dyes from GMSPO and Kent Moore SPX) contain PAG oil that is not compatible with the Hybrid Polyolester (POE) oil. Introducing even small amounts of PAG oil (contained in most AC dyes) can cause damage to the high voltage insulation in the hybrid AC compressor. The insulation damage may lead to a ground isolation fault which would result in a no crank condition

If the vehicle Hybrid AC system has already been injected with any commercially available Ultra Violet (UV) dye, the system should be flushed of all system oil:

1) The system will need to be flushed immediately following the procedures in SI service information ( See Document ID: 2047704 )

2) The AC accumulator will have to be replaced.

3) The compressor will need to be drained and the proper oil balancing procedure will have to be performed. ( See Document Id: 2105559 )

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.