Automatic Operation
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. 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 the coldest position or the warmest position.
- 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 coldest position, 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 warmest position, 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