Chevy switched from R12 to R134a for the model year 1994. Your truck should be R134a.
134A
R134a
R134....But to be sure, lift the hood and there should be a sticker telling you what type of refrigerant to use.
r-134
R134a
r134a
R134a
It takes r134a refrigerant.
r-134
r134a
A 1987 Chevy Blazer uses R12 refrigerant as shipped from the factory. Most have been converted to the more environmentally friendly R134a.
1994 Mercury villagers come factory charged with R134a refrigerant. Vehicles built 1993 or prior were charged with R12 for note.