Unknown Part - Flaps in Engine Bay
5 Year Member
Joined: May 2014
Posts: 4,574
Likes: 970
From: Chico, Ca.
I know this s an old thread, but I recently replaced both sides of these air deflectors and another similar one between the front bumper and the drivers side fender with rubber from a large truck inner tube. I removed all of the plastic push pins, pieced all of the torn fragments together and made a paper pattern. I then transferred this pattern to an old (but in good shape) large truck inner tube, and cut them out with scissors. I used a cheap hole punch that was made for leather to put in the mounting holes. This cost me nothing but time, and I am sure that this rubber will last at least as long as the recycled/composite stuff that came with the truck.
Renaissance Honky
Joined: Jun 2016
Posts: 1,083
Likes: 156
From: Mound, MN
Thanks for all the info on this post. I had to have some front end work done on my 2013 EB F150 and I just realized that they removed the air deflectors and never put them back in. My truck has been running fine here in Colorado since they have been removed, so I'm wondering if any technicians/mechanics out there can give me advice onto whether or not these are really needed or not.
It depends on how hard you use your truck. If you're just commuting it likely won't make any difference. If you get towing hot/high/heavy, having all that air forced through your radiator/cooling stack is a definite benefit. I'm pretty sure that with those dividers in place, grille air is forced through the radiators, and then some is drawn out of the engine compartment through the holes behind the headlights and then under the truck/into the wheel wells. There's definitely a low-pressure space behind the headlights and the front bumpers. At least, that's how it looks on my '07, your '13 may be different.