How do you add freon to a 1992 Cadillac?

To add freon to a 1992 Cadillac, first ensure the vehicle is off and locate the low-pressure service port, usually found on the larger diameter aluminum line connected to the AC compressor. Attach the refrigerant can's hose to the port and start the engine with the AC set to maximum. Open the refrigerant can valve slowly, monitoring the pressure gauge, and fill until the recommended level is reached. Always wear safety glasses and follow proper procedures to avoid overcharging or damaging the AC system.