What type of Freon does a 1992 Isuzu Rodeo 2WD V6 use?

A 1992 Isuzu Rodeo 2WD V6 likely used R134a. While some older vehicles used R12, the transition to R134a was well underway by 1992. It's highly improbable that a 1992 vehicle would still use R12. However, to be absolutely certain, you should check the sticker on the vehicle's air conditioning system (usually under the hood) or consult your owner's manual.