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