FORD 2008 F-550 v.1 - Manual (Page 71)

HEATER ONLY SYSTEM
(IF EQUIPPED)
1. Fan speed adjustment: Controls
the volume of air circulated in the
vehicle.
2. Temperature selection:
Controls the temperature of the
airflow in the vehicle.
3. Air flow selections: Controls the direction of the airflow in the
vehicle. See the following for a brief description on each control:
: Distributes outside air through the instrument panel vents.
: Distributes outside air through the instrument panel vents and the
floor vents.
O (OFF): Outside air is shut out and the fan will not operate.
: Distributes outside air through the floor vents.
: Distributes outside air through the windshield defroster vents,
floor vents and demister vents.
: Distributes outside air through the windshield defroster vents and
demister vents. Can be used to clear windshield of fog and thin ice.
Operating tips
• To reduce fog build up on the windshield during humid weather, place
the air flow selector in the position.
• To reduce humidity build up inside the vehicle during cold or warm
weather, do not drive with the air flow selector in the O (OFF)
position.
• Do not put objects under the front seats that will interfere with the air
flow to the rear seats.
• Remove any snow, ice or leaves from the air intake area at the base of
the windshield.
To aid in side window defogging/demisting in cold weather:
1. Select .
2. Modulate the temperature control to maintain comfort.
3. Set the fan speed to the highest setting.
4. Direct the outer instrument panel vents toward the side windows.
2008 F-250/350/450/550 (f23)
Owners Guide (post-2002-fmt)
USA (fus)
Climate Controls
71