How do you recharge the AC for a 2003 BMW Z4?

To recharge the AC on a 2003 BMW Z4, start by locating the low-pressure service port, typically found on the larger diameter AC line. Attach a refrigerant refill kit to the port and ensure the engine is running with the AC set to the maximum cool setting. Follow the instructions on the refrigerant can to add the appropriate amount of refrigerant, checking the pressure readings periodically to avoid overcharging. After recharging, check for any leaks and ensure the AC system is functioning properly.