To recharge the air conditioning on a 1993 Oldsmobile Cutlass ciera do you use r12 or 134a?

The 1993 Oldsmobile Cutlass Ciera used R12 refrigerant. However, R12 is no longer manufactured due to its harmful effect on the ozone layer. You cannot legally purchase new R12.

If your system needs recharging, you will need to have it converted to use R134a. This involves replacing the seals and potentially other components that aren't compatible with R134a. A qualified mechanic should perform this conversion. Simply adding R134a to an R12 system will likely damage it.