How do you put refrigerant in a 2000 Buick century?

To add refrigerant to a 2000 Buick Century, first locate the low-pressure service port, which is typically on the larger diameter line of the AC system. Attach a refrigerant can with a gauge to this port and ensure the AC is running on maximum cool. Open the valve on the refrigerant can slowly, monitoring the pressure gauge to avoid overcharging. It's important to wear safety glasses and follow the manufacturer's specifications for the type and amount of refrigerant needed.