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What type of freon does a 1991 Chevy silverado use?

A 1991 Chevy Silverado's AC system likely used R-12 (Freon-12). However, R-12 is no longer manufactured due to its ozone-depleting properties. If the system hasn't been converted, it will need to be retrofitted with a different refrigerant and possibly updated components. It's crucial to have a qualified technician perform any AC work.