How do you put freon in Nissan Xterra?

To add Freon to a Nissan Xterra, first, locate the low-pressure service port, typically found on the larger of the two AC lines. Attach the refrigerant canister with a gauge to this port and ensure the engine is running with the AC set to the maximum. Open the valve on the canister slowly and monitor the pressure gauge to avoid overfilling. Always wear safety gloves and goggles, and consider consulting a professional if you're unsure.