Nash/AMC pioneered all up-front air conditioning with help from their Kelvinator division. They also pioneered the fresh-air car heater back in the 1930s.
Quote from the link below:
"In 1954,
Nash-Kelvinator capitalized on its experience in refrigeration to introduce the automobile industry's first compact and affordable, single-unit heating and air conditioning system optional for its all Nash Ambassador, Statesman and Rambler models. Combining heating, cooling, and ventilating, the new air conditioning system for the Nash cars was called the "All-Weather Eye".
The 1954 Nash models were the first American automobiles to have a front-end, fully integrated heating, ventilating, and air-conditioning system. This was the first mass market system with controls on the dash and an electrically-engaged
clutch. This "first true refrigerated air conditioner system" for automobiles was also compact and easily serviceable with all of its components installed under the hood or in the cowl area. With a single thermostatic control, the Nash passenger compartment air cooling option was described as "a good and remarkably inexpensive" system. Entirely incorporated within the engine bay, the combined heating and cooling system had cold air for passengers enter through dash-mounted vents. Nash's exclusive "remarkable advance" was not only the "sophisticated" unified system, but also its US$345 price was significantly less than all the other systems.<sup>"</sup>
http://en.wikipedia.org/wiki/Weather_Eye#All-Weather_Eye