FORD 2008 F-550 v.4 - Manual (Page 77)

To increase airflow to the outer instrument panel vents, close the vents
located in the middle of the instrument panel.
Do not place objects on top of the instrument panel as these
objects may become projectiles in a collision or sudden stop.
MANUAL HEATING AND AIR CONDITIONING SYSTEMS
(IF EQUIPPED)
• Manual heating and air
conditioning system
• Manual heating and air
conditioning system with heated
mirrors
• Manual heating and air
conditioning system with heated
mirrors and heated seats
2008 F-250/350/450/550 (f23)
Owners Guide (post-2002-fmt)
USA (fus)
Climate Controls
77