1996 Ford F150 Owner's Manual - Page 64

Have the exhaust and body ventilation systems checked whenever: u your vehicle is raised for service u the sound of the exhaust system changes u your vehicle has been damaged in a collision Improve your ventilation by keeping all air inlet vents clear of snow, leaves, and other debris. If the engine is idling while you are stopped in an open area for long periods of time, open the windows at least one inch (2.5 cm). Also, adjust the heating or air conditioning to bring in outside air. u HEATING - Set fan speed at MEDIUM or HIGH, the function selector knob on VENT, FLOOR, MIX, or the DEFROST symbol and the temperature control knob on any desired position. MEDIUM or HIGH, the function selector knob on NORM or VENT and the temperature control knob on any desired position. u AIR CONDITIONING - Set the fan speed at 62