Electronic Automatic Temperature Control

With the use of a microcontroller, the climate control assembly (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
• sunload sensor
• vehicle speed sensor
• engine coolant temperature sensor
• evaporator discharge air temperature sensor

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

• A/C clutch engagement
• blower speed
• air temperature blend door position
• floor/panel door position
• panel/defrost door position
• air inlet duct door position