1996 Ford F250 Owner's Manual - Page 87

To turn your Heater system on, select any position except OFF. This will turn the fan ON and allow air flow into the vehicle. Select OFF to turn your Heater off. This will turn the fan off and stop outside air from coming into the vehicle. Temperature selection The Temperature knob is the rotating knob located at the center 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 cool or unheated temperature area. Any position selected between full right and full left will give a temperature between the two extreme temperatures. The cool temperature you select will not be cooler than the outside temperature. 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 fan speed and increase the amount of of air entering the vehicle. Four fan speed positions are available and are indicated by LO, two separate 85