What refrigerant does your 1993 Chevrolet pickup use?

A 1993 Chevrolet pickup truck likely used R-12 (Freon-12) in its air conditioning system. However, it's crucial to verify this with your vehicle's owner's manual. R-12 is no longer produced due to its ozone-depleting properties, and any vehicle using it would almost certainly have been converted to a different refrigerant (like R-134a) at some point. Checking the sticker on the underside of the hood, or consulting a mechanic, would give you the most definitive answer.