1994 Oldsmobile Achieva Owner's Manual - Page 109

BI-LEV (Bi-Level) : 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 theupper portion of your bodythrough the instrument panel outlets, butslightly warmer air is directed through the heater ducts and defroster vents. At times this temperature difference may be more.apparent thanothers. HEAT (Heater): This setting directs air through the heater ducts, and some through the windshield defroster vents. Set thecenter control for the desired temperature. If you have the optional engine coolant heater anduse it during cold weather, 0°F (-18°C) or lower, your heating system willmore quickly provideheat because the engine coolant is already warmed. See the Index under Engine Coolant Heater. DEFOG: This setting divides air flow equally between the heater ducts and the windshield defroster vents. DEF (Defrost): This setting directs most air through the windshield defroster vents, andsome through the heater ducts. Defogging Windows To defog the windshield, turn all three control knobs to thef a r right. 107