Dual-Zone Electronic Automatic Temperature Control

The dual-zone electronic automatic temperature control (EATC) 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
• Dual sunload sensor
• Vehicle speed
• Engine RPM
• Engine coolant temperature
• Actuator door position controls
• Driver and passenger heater core air discharge temperature sensors
• Evaporator discharge air temperature sensor

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

• A/C clutch engagement
• Blower speed
• Panel door position
• Defrost door position
• Floor door position
• Air inlet duct door position
• Coolant control valve
• Electric water pump (3.9L engine)
• External temperature (outside temperature display)