1993 Oldsmobile Achieva Owner's Manual - Page 118

Comfort Controls & Audio Systems Air Condiiioning(CONI) Ventilation Heating Turning the right knob to HEAT (Heater) and the center knob clockwise will send heated air through the heater ducts, and some through the defroster vents. VENT and HEAT are economical positions because the air conditioner compressor doesn't run in these two settings. This reduces engine load, resulting in improved fuel economy. If either setting fails to keepyou comfortable, or causes your windows to fog up, turn the right knob to one the of - air conditioning positions, or to DEF (Defrost). If you have the optional 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 theIndex under Engine Block Heater. NORM: Use for normal cooling on hot Use when outside temperatures are days. This setting cools outside air and mild, and little heating or cooling is directs it through the instrument panel needed. Turn the right knob to VENT. outlets. Air flow is directed through the instrument panel outlets. Set the center BI-LEV (Bi-Level): Use on cool, but knob to the temperature desired. 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 is directed through the heater ducts and defroster vents.At times this temperature differencemay be more apparent than others. The air conditioner compressor operates in all three air conditioning positions. It also operates in (@ DEF (Defrost) and in DEFOG when the outside temperature is higher than about40°F (4.5"C). w