Refrigerant-134a

CAUTION: R134a refrigerant is not compatible with R-12 refrigerant in an air conditioning system. R12 in a R134a system will cause compressor failure, refrigerant oil sludge or poor air conditioning system performance.


This vehicle uses a refrigerant called Refrigerant-134a (R134a). It is a nontoxic, nonflammable, clear, colorless, liquid gas. While the R134a A/C system is very similar to an R-12 A/C system, the differences in the refrigerant, lubricants, and service equipment are important

Refrigerant-134a carries a charge of a special lubricating oil, Polyalkylene glycol (PAG). GM PAG refrigerant oil will gave a slight blue tint. The oil is hydroscopic (absorbs water from the atmosphere) and should be stored in closed containers.

Use only PAG synthetic refrigerant oil for internal circulation through the R134a A/C system and only mineral base 525 viscosity refrigerant oil on fitting threads and O-Rings.

If lubricants other than those specified are used, compressor failure and/or fitting seizure is likely to occur.