Heating Ventilation Air Conditioning (HVAC) Control Module - Electronic Automatic Temperature Control (EATC)

The EATCHVAC control module is on the MS-CAN and sets DTCs. A/C requests are sent to the GWM and then to the PCM via the HS-CAN1.

The temperature control switch adjusts the discharge air temperature. Movement of the temperature knob from cool to warm causes a corresponding movement of the temperature door. The position of the temperature door determines the discharge air temperature. The temperature control selector is an integral part of the HVAC control module and cannot be serviced separately.

The airflow mode setting adjusts the discharge air outlet location. Each airflow mode selector icon causes a corresponding movement of the airflow mode doors and determines the discharge air outlet location. The airflow mode selector knob is an integral part of the HVAC control module and cannot be serviced separately.

The A/C button determines A/C compressor operation, except when the temperature selector is set to MAX A/C or the airflow mode selector is in Defrost mode. The A/C button is an integral part of the HVAC control module and cannot be serviced separately.

The recirculated air request button can be activated in any mode except Defrost. In MAX A/C mode the recirculated air indicator is illuminated (recirculated air forced on). The recirculated air request button is an integral part of the HVAC control module and cannot be serviced separately.