BI-LEV (Bi-Level) Mode
WARNING: This page is about a different car, the 1997 Oldsmobile Cutlass Supreme. However, it is still accessible from the selected car via links, so may be relevant.
In this mode, controlled air flows through heater and A/C outlets. System is automatically controlled, and adjusts to temperature selected range. System controls blower motor speed and air inlet by interpreting various input signals.