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

The dual-zone EATC module analyzes input from the following major sources:

• Temperature, mode and blower selection (made by the vehicle occupants)
• In-vehicle temperature
• In-vehicle humidity (Navigator only)
• Ambient temperature
• Evaporator discharge air temperature
• Sunload
• Vehicle speed
• Engine coolant temperature

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

• A/C compressor operation
• Blower speed
• LH side temperature blend door position
• RH side temperature blend door position
• Airflow mode door positions