According to my official reproduction Owner's Manual (tongue planted firmly in cheek), the ac knob on the lower right of the console will start recirculating air at 2/3 switch travel to the right (clock-wise). There will be a small amount of fresh air let in and the fan will switch to low speed operation.
For rapid cooling the manual recommends turning the ac switch and the blower switch to the left of it, clockwise to stop (full on). It also recommends moving levers 2 and 3, counting from left to right, to the "closed" position. It then recommends moving the lever above the radio to the open position, along with the levers to the left-most of the driver and the right-most of the passenger.
Hope this helps.
Recently bought the manual at Adsit if you are looking for one. www.adsitco.com.