1996 Mercury Sable Owner's Manual - Page 121

Function selector knob The function selector knob controls airflow to the inside of the vehicle. MAX A/C MAX A/C uses recirculated air to cool the vehicle. It allows for faster cooling but is noisier than A/C. The airflow will be from the instrument panel registers. A/C A/C uses outside air to cool the vehicle. It is quieter that MAX A/C, but not as economical. The airflow will be from the instrument panel registers. VENT VENT brings in outside air through the instrument panel registers. It can be used for heating or ventilating. OFF In OFF, outside air is shut out and the fan will not operate. S (Panel and floor) This brings in outside air through the instrument panel registers and the front and rear floor ducts. It can be used for heating or ventilating. R (Floor) This allows for maximum heating. The airflow is from the front and rear floor ducts. 94