When servicing the air conditioning system, a refrigerant charging station and a recovery/recycling device must be used.
The air conditioning systems for 1989-93 trucks uses R-12 refrigerant. The systems for 1994-96 trucks use R-134a refrigerant.WARNING
The R-12 or R-134a refrigerant used in air conditioning systems is not interchangeable. Do not substitute even a small amount of the incorrect refrigerant in a given system. Clogging and possible component failure may result.