Fresh (that is, outside air) was only supplied to the '74-and up Panteras. Behind the glove box there was a 2" or so flex-tube that connected to the passenger side cowl opening just in front of the windshield. The tube terminated at a special heater control junction box alongside the heater/AC enclosure. These cars used different heater/defroster controls too, and one selection was "fresh air." All earlier Panteras use recirculated air from inside the cab to supply the heater/AC enclosure.
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