How do you add freon to Chevy cobalt 2005?

To add Freon to a 2005 Chevy Cobalt, first locate the low-pressure service port, which is typically near the accumulator on the larger diameter aluminum line. Ensure the engine is off and the AC is set to the maximum cool setting. Attach the refrigerant can to the low-pressure port and open the valve on the can while running the engine and AC. Monitor the pressure gauge on the refrigerant can and avoid overfilling; stop when the system reaches the appropriate pressure range.