Ford 2010 F-150 Owner's Manual page 313

Driving
Engine temperature while plowing
When driving with a plow, your engine may run at a higher temperature
than normal because the attached snowplow blade will restrict airflow to
the radiator.
If you are driving more than 15 miles (24 km) at temperatures above
freezing, angle the plow blade either full left or full right to provide
maximum airflow to the radiator.
If you are driving less than 15 miles (24 km) at speeds up to 40 mph
(64 km/h) in cold weather, you will not need to worry about blade
position to provide maximum airflow.
Factory installed snow plow prep package vehicles already have been
programmed with the unique power train control strategy to provide
proper cooling. If the vehicle is being upgraded to the equivalent
hardware set as the snow plow prep package, then the vehicle can obtain
the unique power train control strategy to provide proper cooling by
getting service at an authorized dealer. The powertrain control strategy
required for snowplowing to provide proper cooling may increase fan
noise that may also be noticed under conditions other than snow
plowing.
313
2010 F-150 (f12)
Owners Guide, 1st Printing
USA (fus)