I was called to diagnose a Goodman AC system. I arrived at the customer's home and began by inspecting the unit's electrical connections and components. I then used a diagnostic tool to check the system's refrigerant pressure and voltage. After that, I performed a thorough inspection of the unit's coils, fins, and blower wheel to ensure they were clean and functioning properly. Finally, I tested the unit's airflow and temperature control to ensure it was operating correctly.