R134a
Chevy switched from R12 to R134a for the model year 1994. Your truck should be R134a.
All cars manufactured after 1993 were required to use R134a refrigerant.
1994
1993 in the US
1995
It is R134a. Ford started the conversion in 1994 but not all Fords were using R134a that year. By 1996 all were using it. Look for a sticker on the A/C unit which lists the correct refrigerant. If you have R12 have it converted to R134a.
R134a, just like any other vehicle for that model year.
It switched with the 1994 model year.
1993-94,depending on the automaker.
Freon is a brand name of refrigerant. Your Toyota takes R134a refrigerant.
R134a is a refrigerant gas