How do you add refrigerant to a 1999 Mazda miata?

To add refrigerant to a 1999 Mazda Miata, first locate the low-pressure service port, which is typically found near the accumulator on the passenger side. Ensure the AC system is off, then attach a refrigerant gauge and hose to the port. With the engine running and the AC set to maximum, slowly add the refrigerant while monitoring the gauge to avoid overcharging. Always follow safety precautions and consider consulting a professional if unsure.