Control Components - Electronic Automatic Temperature Control (EATC): Notes
WARNING: This page is about a different car, the 2003 Mercury Sable and 2003 Ford Taurus. However, it is still accessible from the selected car via links, so may be relevant.
With the use of a microcontroller, the electronic automatic temperature control (EATC) module (18C612) analyzes input from the following major sources:
- temperature, air distribution and blower selection (made by the vehicle occupants)
- in-vehicle temperature
- ambient temperature
- sunload
- vehicle speed
- engine coolant temperature
Using these inputs, the microcontroller determines the correct conditions for the following outputs:
- A/C compressor clutch (19D786) operation
- blower speed
- air temperature blend door position
- plenum/floor door position
- windshield defroster door position
- air inlet door position
- floor console door position.