Automatic Operation

In automatic operation, the HVAC control module will maintain the comfort level inside of the vehicle by controlling the A/C compressor clutch, the blower motor, the air temperature actuators, mode actuator and recirculation.

To place the HVAC system in Automatic mode, the following is required:

• The Auto switch must be activated
• The air temperature switch must be in any other position other than full hot or full cold position

Once the desired temperature is reached, the blower motor, mode, recirculation and temperature actuators will automatically be adjusted to maintain the temperature selected. The HVAC control module performs the following functions to maintain the desired air temperature:

• Monitor the following sensors:
  • Inside air temperature sensor
  • Ambient air temperature sensor
  • Lower left air temperature sensor
  • Lower right air temperature sensor
  • Upper left air temperature sensor
  • Upper right air temperature sensor
• Regulate blower motor speed
• Position the air temperature actuator
• Position the mode actuator
• Position the recirculation actuator
• Request A/C operation