How put on freon 2002 Lincoln Navigator?

To add Freon to a 2002 Lincoln Navigator, first ensure the vehicle is off and locate the low-pressure service port, typically found on the larger of the two A/C lines. Attach the refrigerant can's hose to the port, making sure it's secure. Start the vehicle and turn the A/C to the maximum setting; then, open the canister valve slowly to allow the Freon to enter the system. Monitor the pressure gauge on the can to avoid overfilling, and check for cool air from the vents as you add refrigerant.