Where do recharge the ac on a 1991 Nissan 240?

To recharge the AC on a 1991 Nissan 240, locate the low-pressure service port, which is typically found on the larger diameter aluminum line between the compressor and the evaporator. Remove the cap from the port, attach the AC recharge kit, and follow the instructions on the refrigerant can to add the appropriate type and amount of refrigerant. Make sure the engine is running and the AC is set to the maximum cool setting during the process. Always check for any leaks and ensure the system is properly sealed before recharging.