FORD 2009 F-550 v.1 - Manual (Page 88)

To aid in side window defogging/demisting in cold weather:
1. Select .
2. Select A/C.
3. Adjust the temperature control to maintain comfort.
4. Set the fan speed to the highest setting.
5. Direct the outer instrument panel vents towards the side windows.
To increase airflow to the outer instrument panel vents, close the vents
located in the middle of the instrument panel.
2009 F-250/350/450/550 (f23)
Owners Guide, 1st Printing
USA (fus)
Climate Controls
88