1996 Ford F250 Owner's Manual - Page 84

To turn your air conditioner and heater system on, select any position except OFF. This will turn the fan on and allow airflow into the vehicle. To turn your air conditioner and heater off, select OFF. This will turn the fan off and stop airflow from coming into the vehicle. Temperature selection The temperature knob is the rotating knob located at the center of of the control with tapered RED and BLUE bands surrounding most of the knob. The wide RED part of the band (full right) is the heat or warmer area. The wide BLUE area (full left) is the cooling or cool temperature area. Any position selected between full right and full left will give a temperature between the two extreme temperatures. H Fan speed adjustment The H knob on the control is the fan speed knob which controls the volume of air flow. Rotate the H knob to the right to increase the amount of air entering the vehicle. Four fan speed positions are available and are indicated by LO, two separate dots and HI beside the H control knob. The HI position provides the most air flow. Airflow selections VENT Use VENT to bring outside air through the instrument panel registers. You can heat the air in this position by rotating the center knob into the RED area. The air CANNOT be cooled below the outside temperature regardless of the center knob setting. Select NORM A/C or MAX A/C to get cool air through the instrument panel registers. 82