Does a 95 Oldsmobile Achieva use freon or has it been converted and need to be charged?

1995 Oldsmobile Achievas used R-134a refrigerant, not R-12 (Freon). Therefore, it wouldn't have been converted from R-12. If the A/C isn't working, it likely needs to be recharged with R-134a or there's another problem with the system (leak, compressor failure, etc.).