Electronic Automatic Temperature Control (EATC)
WARNING: This page is about a different car, the 2009 Mercury Grand Marquis and 2009 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
The heating ventilation air conditioning (HVAC) module analyzes input from the following major sources:
- Temperature, function and blower selection (made by the vehicle occupants)
- In-vehicle temperature sensor
- Ambient temperature sensor
- Sunload sensor
- Vehicle speed sensor
- Engine coolant temperature sensor
Using these inputs, the HVAC module determines the correct conditions for the following outputs:
- A/C clutch engagement
- Blower speed
- Temperature blend door position
- Floor/panel mode door position
- Panel/defrost mode door position
- Air inlet mode door position