1. Open the hood of your vehicle.
2. Locate the A/C compressor. It's usually a round or cylindrical metal object with a black cap on the top.
3. The low-pressure service port is located on the side of the A/C compressor.
4. Pull off the cap and attach your refrigerant hose to the port.
5. The high-pressure service port is located on the high side of the A/C compressor, usually labeled as "H". It is not recommended to access the high side port unless you have proper training.
