1995 Oldsmobile Achieva Owner's Manual - Page 128

MODE CONTROL: The right control knob changes the functions of your system. VENT: Use when outside temperatures are mild, and little heating or cooling is needed. Air flow is through the instrument panel outlets. Set the center control knob to the temperature desired. If you have the optional engine coolant heater (engine block heater) and use it during cold weather, 0°F (- 18' C) or lower, your heating system will more quickly provide heat because the engine coolant is already warmed. See "Engine Coolant Heater (Engine Block Heater)" in the Index. BI-LEV: Use on cool, but sunny days. This setting brings in the outside air, but directs it in two ways. The cool air is directed to the upper portion of your body through the instrument panel outlets, but slightly warmer air isdirected through the heater ducts and defroster vents. At times this temperature difference may be more apparent than others. DEFOG: This setting divides air flow equally between the heater ducts and the windshield defroster vents. DEF: This setting directs air through the windshield defroster vents located on top of the instrument panel. Defogging Windows To defog the windshield, turn all three control knobs to the far right. HEAT This setting brings heated air through the heater ducts, and some through the windshield defroster vents. 3-2