What type of freon goes in my 89 Bonneville with a 3800 engine?

A 1989 Pontiac Bonneville with a 3800 engine uses R-12 refrigerant. However, R-12 is no longer manufactured due to its ozone-depleting properties. Any repair shop working on your A/C system will need to use a legal R-12 replacement or a retrofit kit to convert your system to a compatible modern refrigerant (like R-134a). Do not attempt to add R-12 yourself. It's illegal to purchase and handle it without the proper certification.