Automatic Operation
WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
In order to place the HVAC system in Automatic mode these requirements need to be meet:
- The blower motor switch must be in the Auto position.
- The air temperature switch must be in any other position other than 66° or 82°.
- The mode switch must be in the Auto position.
The HVAC control module will perform the following routines to maintain the desired air temperature:
- Monitor the following sensors:
- The inside air temperature sensor
- The ambient air temperature sensor
- The upper air temperature sensor if cool air is required
- The lower air temperature sensor if warm air required
- The sunload sensor
- Regulate blower motor speed.
- Position the air temperature actuator
- Position the mode actuator
- Position the recirculation actuator
- Request A/C operation
When the temperature is placed in the 66° position, full cold, the HVAC control module will do the following:
- The automatic blower will go to maximum speed
- The automatic mode will position the mode door to the Panel position
When the temperature switch is in the 82° position, full hot, the HVAC control module will do the following:
- The automatic blower will go to maximum speed
- The automatic mode will position the mode door to the Floor position