The Autel MaxiHVAC AC909D is an A/C and thermal management diagnostic system for vehicle refrigerant and climate-control service. The system includes the AC909 tablet, MaxiFlash VCI, refrigerant scale, compressor box, Bluetooth vacuum pump, digital micron gauge, four-port manifold, and temperature and humidity probes. Live micron-level vacuum measurements allow technicians to verify moisture removal and perform automated decay testing. The system combines refrigerant pressures, temperatures, humidity, airflow, electrical data, and vehicle sensor information. Guided procedures support leak testing, refrigerant service, and diagnostics for compressors, evaporators, condensers, metering devices, and blockages.