Electronic Automatic Temperature Control (EATC): Notes
WARNING: This page is about a different car, the 2008 Mercury Mariner and 2008 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
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