FORD 2010 F-150 v.1 - Manual (Page 318)

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.
Driving
318
2010 F-150 (f12)
Owners Guide, 1st Printing
USA (fus)