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, the mode actuator and the recirculation actuator.

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:

• Monitors the following sensors:
  • The inside air temperature sensor
  • The ambient air temperature sensor
  • The lower left air temperature sensor
  • The lower right air temperature sensor
  • The upper left air temperature sensor
  • The upper right air temperature sensor
• Regulates blower motor speed
• Positions the air temperature actuators
• Positions the mode actuator
• Positions the recirculation actuator
• Requests the A/C operation