K 2500 Truck 4WD V8-6.5L DSL Turbo VIN S (1998)
Refrigerant: Description and Operation
CAUTION: Avoid breathing A/C Refrigerant-134a and lubricant vapor and mist. Exposure may irritate eyes, nose, and throat. To remove
R-134a from the A/C system, use service equipment certified to meet the requirements of SAE J221O (R-134a recycling equipment). If
accidental system discharge occurs, ventilate the work area before resuming service. Additional health and safety Information may be obtained
from the refrigerant and lubricant manufacturers.
Like the coolant in the engine cooling system, the refrigerant is the substance in the air conditioning system that absorbs, carries, and then releases heat.
Although various substances are used as refrigerants in other types of refrigeration systems, some automotive air conditioning systems use a type called
Refrigerant-12 (R-12).
This vehicle uses Refrigerant-134a (R-134a). It is a non-toxic, non4lammable, clear, gas.
While the R-134a A/C system is very similar to an R-12 A/C system, the differences in the refrigerant, lubricants, and service equipment are important.
NOTICE: R-134a refrigerant is not compatible with R-12 refrigerant in an air conditioning system. R-12 in an R-134a system will cause compressor
failure, refrigerant oil sludge, or poor air conditioning system performence.
Refrigerant-134a carries a charge of a special lubricant called polyalkaline glycol (PAG) refrigerant oil. GM (PAG) refrigerant oil has a slight blue tint.
The oil is hydroscopic (absorbs water from the atmosphere). Store it in closed containers.
