What kind of freon goes in 1991 geo prizm?

The 1991 Geo Prizm uses R-12 refrigerant, commonly known as Freon. However, due to environmental regulations, R-12 is no longer produced, so many vehicles that originally used it have been retrofitted to use R-134a, a more environmentally friendly alternative. If you're servicing a 1991 Geo Prizm, it's important to check whether it has been converted to R-134a or if it still uses R-12.