Dual Electronic Automatic Temperature Control

With the use of a microcontroller, the dual automatic temperature control (DATC) 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 temperature

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

• A/C clutch engagement
• blower speed
• cold air bypass door position
• panel door position
• defrost door position
• floor door position
• air inlet duct door position
• driver coolant control valve
• passenger driver coolant control valve
• electric water pump (3.9L engine)
• heater wiper rest or heated windshield
• heated rear window rear defog
• external temperature (outside temperature display)