Mode Selector Buttons
WARNING: This page is about a different car, the 2001 Pontiac Bonneville and 2000 Pontiac Bonneville. However, it is still accessible from the selected car via links, so may be relevant.
Pressing AUTO button tells A/C-heater programmer to select appropriate air intake and discharge points and activate or deactivate A/C compressor. System temperature is determined by operator selected preset temperature and system sensors.