Dual Automatic Temperature Control (DATC) System

The DATC system maintains the selected vehicle interior temperature by heating and/or cooling the air.

• During A/C operation the system also reduces the relative humidity of the air.
• The driver may override the automatic mode of operation.
• The temperature control setting determines the desired air temperature.
• The blower motor control override buttons vary the blower motor speed.
• The driver side and passenger side temperature settings can be individually controlled.

The DATC system operation is determined by the settings on the HVAC module - DATC. The DATC system automatically maintains a selected temperature for vehicle interior comfort, including capabilities to maintain separate temperature settings for the driver and front passenger. The electronic temperature control capabilities are achieved by splitting the air distribution system internally and utilizing 2 individually operated temperature blend doors. The DATC system is composed of the HVAC module - DATC, solenoid and manifold assembly, blower motor speed control, 4 vacuum control motors, 2 temperature blend door actuators, in-car temperature sensor, ambient air temperature sensor and solar radiation sensor to control the various functions.

When the HVAC module - DATC is set to AUTO:

• the air distribution direction, heater control valve operation and blower motor speed are automatically controlled based on the temperature(s) selected.

The HVAC module - DATC manual override settings:

• allow the air distribution direction to be manually selected.
• allow the blower motor speed to be manually selected.
• allow RECIRCULATION mode to be manually selected except in FLOOR/DEFROST and DEFROST. The A/C request can be cancelled by pressing the A/C request switch, turning the indicator off.
• allow A/C compressor operation to be manually selected except in FLOOR/DEFROST and DEFROST.

The HVAC module - DATC also includes:

• an EXT button to monitor ambient (outside) air temperature. By pressing the EXT button the ambient temperature will be displayed on the HVAC module - DATC display until the EXT button is pressed again.
• a F°/C° temperature conversion button to toggle the temperature being displayed from Fahrenheit and Celsius.
• a rear window defrost button (Explorer only). Refer to GLASS, FRAMES AND MECHANISMS article.

Dual temperature control can be enabled in AUTO or in all manual override settings. When the HVAC module - DATC is set to DUAL:

• the DATC system enables varying temperatures to be selected by the driver and the front passenger. Dual temperature control is indicated by the presence of 2 temperature settings on the HVAC module - DATC display. To return to single temperature control press the DUAL button, turning the DUAL button indicator off and the front passenger temperature display off.
• the air distribution direction and the blower motor speed cannot be varied between the driver and front passenger. Only the temperature settings can be varied.
• the system will favor the driver temperature setting if the driver and front passenger temperature set points vary greatly.