Electronic Automatic Temperature Control (EATC): Notes

The HVAC module analyzes input from the following major sources:

• Temperature, airflow mode, blower, A/C and RECIRC selection (made by the vehicle occupants)
• ECON button (hybrid only)
• In-vehicle temperature sensor (2.3L or 3.0L)
• In-vehicle temperature and humidity sensor (hybrid only)
• Ambient temperature sensor
• Sunload sensor (solar radiation sensor)
• Evaporator discharge air temperature sensor
• Vehicle speed
• Engine coolant temperature

Using these inputs, the HVAC module determines the correct conditions for the following outputs:

• A/C compressor ON/OFF request
• Blower motor speed
• Temperature blend door position
• Airflow mode door position
• Air inlet door position