1. Turn off the engine and allow it to cool down completely.
2. Open the hood.
3. Locate the low-pressure service port on the AC system. It is usually a metal fitting with a Schrader valve.
4. Attach a vacuum pump to the low-pressure port.
5. Turn on the vacuum pump and let it run for at least 15 minutes. This will remove all of the air from the AC system.
6. Turn off the vacuum pump and disconnect it from the low-pressure port.
7. Close the hood.
Your Honda AC system is now vacuumed and ready to be recharged with refrigerant.
