It depends on the year but in most cases from 1993 and up they will use R134a freon but you can always check the VIN number with the dealer and remember that R134a freon will have larger service ports that R-12 freon............
What is the freon capcity 1992 454 pace arrow motorhome
The 1998 Chevrolet 2500 pickup truck has a Freon capacity of 5.5 pounds. You should never overfill the Freon in your cooling system.
The recommended freon capacity is 1.75 lbs
44 oz or 3 freon cans
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where do I add freon to my air conditioning unit on a 1997 chevy truck?
A wiring diagram for this car can be found in this cars manuals. The manuals are bought at an auto part store.
R134a