Control Module HVAC: Description and Operation

ELECTRONIC AUTOMATIC TEMPERATURE CONTROL (EATC) MODULE DESCRIPTION

The EATC system automatically maintains a selected temperature for vehicle interior comfort and regulates the volume of airflow between the instrument panel registers, floor ducts, windshield defroster nozzle and side window demisters. The system will automatically select between fresh and recirculated air with an optional manual override. The EATC system will also include a manual A/C override, blower speed override and airflow direction overrides.

The dual temperature zone feature provides the driver and the front seat passenger with their own independent temperature set points. The EATC system provides both the driver and front seat passenger with their selected temperature for interior comfort. In situations where the difference between the driver and the front seat passenger set points are very large, the EATC will tend to favor the driver's setting and make the front seat passenger as comfortable as possible.

The driver and front seat passenger will not have independent air distribution mode or fan controls so the system is dual temperature only. In some cases, the passenger temperature set point may influence the air distribution mode or blower speed in automatic mode.