you dont only a certified repair shop can handle R12
1994 Chevy lumina freon type
It will be on the compressor also the quantity needed to fill it if it is completely empty. It is 134.
Use R134a refrigrant. The low side port is located beneath the air filter box which will have to be removed to access the port. Follow the instruction on the can.
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