FORD 2009 F-550 v.3 - Manual (Page 83)

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, 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
airflow to the rear seats.
• Remove any snow, ice or leaves from the air intake area at the base of
the windshield.
• To improve the A/C cool down, drive with the windows slightly open
for 2–3 minutes after start up or until the vehicle has been “aired out.”
During extreme high ambient temperatures when idling stationary for
extended periods of time in gear, it is recommended to run the A/C in
the MAX A/C position, reduce blower fan speed from the highest setting
and put the vehicle’s transmission into the PARK gear position
(automatic transmission only) to continue to receive cool air from your
A/C system.
For maximum cooling performance in MAX A/C mode:
1. Move the temperature control to the coolest setting.
2. Set the fan to the highest speed initially, then adjust in order to
maintain comfort.
To aid in side window defogging and demisting in cold weather:
1. Select .
2. Select A/C.
3. Set the temperature control to maintain comfort.
4. Set the fan speed to highest setting.
5. Direct the outer instrument panel vents towards the side windows.
2009 F-250/350/450/550 (f23)
Owners Guide, 3rd Printing
USA (fus)
Climate Controls
83