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Chris, I think the real issue in the case of a pickup is that people generally want the cold air blowing on their face and upper body, especially during cooldown. Having it blow on your ankles may cool the cab down just as well, but if the sun is still shining on your arms and chest, it won't feel like it. I suppose you could snake some tubes up behind the seat to blow forward, but that would be awkward.
As much room as is in the fenderwells, something like the Magic Aire system would seem the logical way to go -- put it in there and feed conditioned (heated or cooled) air into the cab thru that port. You'd need to suck fresh air from the front.
Could someone install the parts of the A/C that go in the vehicle someplace besides the dash? Maybe under the seat?
I just mounted an AC evaporator under the dash of my 49. I bought it years ago for a different project. It was air only as purchased. I added some enclosure fabbed out of black ABS sheet stock to house a heater coil, added it to the existing AC enclosure and fit the whole setup under the dash. I maintain an operating cowl vent, electric wiper but will lose about 1/3 of the glovebox. Note that this would not work with a radio in the stock position. I agree with ALBUQ F-1, cold air sinks. You want the AC to direct toward your upper body.
Rezvani's Latest Post-Apocalyptic 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.