Ford Vehicle Owner's Manual page 64

Have the exhaust and body ventilation systems
checked whenever:
your vehicle is raised for service
the sound of the exhaust system changes
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.
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.
AIR CONDITIONING — Set the fan speed at
MEDIUM or HIGH, the function selector
knob on NORM or VENT and the
temperature control knob on any desired
position.
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