What type of freon do you use to recharge the ac in a 1993 Saturn SC1?

Answer 1

Refrigerant, not freon - Freon is specific to certain types of refrigerants manufactured by DuPont.

The question which needs to be asked here is whether or not you're the original owner of the vehicle. And here's why..

A 1993 Saturn would have come from the factory with an AC system which uses R-12 refrigerant. Automotive AC systems were mandated to switch to R-134a beginning with the 1995 model year. Many people who had vehicles with R-12 systems ended up having them converted to R-134a. However, the complete R-134a conversion kits were (and still are) very expensive, so many people had a much simpler but operational enough conversion done which mainly changed fittings, the metering device, and the oil in the compressor. Most of these conversions did not replace the schrader valves, and thus these systems will still have R-12 schrader valves.

If you're not the original owner or you don't know the complete history of the vehicle, I would strongly recommend that you have a shop do a refrigerant purity test so that you can know for certain whether it was converted to R-134a or not.