Dual-Zone Electronic Automatic Temperature Control (EATC): Notes

The HVAC 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
• Sunload sensor (solar radiation sensor)
• Vehicle speed
• Engine coolant temperature

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

• A/C compressor operation
• Blower speed
• RH and LH temperature blend door positions
• Defrost/panel/floor airflow mode door position
• Air inlet door position