How do you freon charge 2002 Nissan fronter?

To recharge the air conditioning system of a 2002 Nissan Frontier with Freon, first locate the low-pressure service port, which is usually on the larger diameter A/C line. Ensure the engine is off and connect the refrigerant can to the port. Start the engine and turn on the A/C to the maximum setting. Slowly release refrigerant into the system while monitoring the pressure gauge until it reaches the recommended level, then disconnect the can and check for proper A/C function.