Discharging the air conditioning (AC) system of a car should only be done by a qualified professional with the proper equipment and training. Handling automotive AC refrigerant without the necessary knowledge and tools can be dangerous and harmful to the environment. AC refrigerant contains chemicals that can be harmful if released into the atmosphere.
If your car's AC system requires maintenance or repair, it's best to take it to a certified automotive technician or an AC specialist. They have the expertise and equipment to safely evacuate the refrigerant from the system and handle it appropriately.
When dealing with car AC systems, it's essential to prioritize safety and environmental responsibility. DIY attempts to discharge the AC can lead to refrigerant leaks, personal injury, or environmental pollution. Always seek professional help to ensure the job is done correctly and responsibly.