Electronic Automatic Temperature Control: Notes

The electronic automatic temperature control (EATC) module analyzes input from the following major sources:

• temperature, airflow direction, blower, A/C and RECIRC selection (made by the vehicle occupants)
• in-vehicle temperature sensor
• ambient temperature sensor
• solar radiation sensor
• vehicle speed
• engine coolant temperature

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

• A/C compressor operation
• blower speed
• temperature blend door position
• defrost/panel/floor door position
• air inlet door position