How to put freon in 2003 hounda civic?

To add Freon to a 2003 Honda Civic, first ensure the engine is off and the AC system is off. Locate the low-pressure service port, which is typically on the larger AC line, and connect the refrigerant can's hose to it. Start the engine and turn the AC to the maximum setting, then slowly open the can's valve to add Freon, checking the pressure gauge frequently. Once the desired level is reached, disconnect the hose, and check for any leaks.