When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I'm guessing it's where the tube that originates above the right headlight and goes to the heater. It's a fresh air tube. Most didn't survive, mainly due to the salty location. My Magic Air heater has one but I'm not sure if the others did.
Are we talking about the square hole, approx 3"x3" with the three studs around it?
That looks like the ducting hole for the MagicAire heater/vent system. If you look at your front clip, there should be some ductwork the goes from just above the passenger side headlight to blower motor that bolted to those three studs.
On the trucks without the MagicAire option there is a small block off panel above the passenger side headlight
The parts in the red dashed line run inside the passenger side fender from above the right head light to the side of the cab. The heater was an accessary and in some parts of the country the trucks were delivered without a heater.
Mine looks like it has weldnuts on the outside of the cab with bolts going thru them so I assume there must have been a plate and my truck did not come with the MagicAire system. I bet those parts would be hard to find and cost a small fortune.
They show up every once in a while and sell around for $150. This is listed for a '51-52 but I have have the same system in my '49 F-2, I got with the '48 F-7 firetruck cab I used for the truck. The piece above the grill would be different for the '48-50 than the one for the '51-52 truck but I'm sure it could be made to work. I would assume, like with a lot of these trucks, parts were added over the years and nothing is really set in stone as to what is actually the correct part. Many people had dealers install accessaries after the vehicles were bought, even years later so the dealer used whatever they could get their hands on.
There is a pic in my gallery of a heater that my truck came with when I got it. Since I live in the deep south dont think I am going to need the factory heater.
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.