Ford provided one for my brother when he bought his 2008 F350 (it came at no charge with the vehicle). It must have been available that year. I certainly don't see it on my options list for this year. I think it is more for keeping snow out of the intake than restricting cold air coming in.
F350 4x4 Crew, Short Bed, Diamondback Tonneau, DuraFlaps, Ford LockPick, Extended Remote Start, DDM HIDs all around, Epic door seals
If you are asking about a winter front, yes, if fully closed and the temp warms up while you are driving or pulling a longer hill, it can/will bring the engine temp up. Either watch the gauge and use the throttle accordingly or open the front a bit. Usually there is a snap or two to open up the winter front without taking it off.
86 F-250 4x4
Cummins BT 5.9
Dads 87 F-250
4x4-5sp 6.9 Turbo
73,000 original miles
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