Automatic Operation
WARNING: This page is about a different car, the 2003 Buick Regal and 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
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 blower motor switch must be in the AUTO position.
- The air temperature switch must be in any other position other than 66 or 88 degrees.
- The mode switch must be in the Auto 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
- Upper air temperature sensor if cool air is required
- Lower air temperature sensor if warm air is required
- Sunload sensor
- Regulate blower motor speed.
- Position the air temperature actuator.
- Position the mode actuator.
- Position the recirculation actuator.
- Request A/C operation.