Here are pictures and a description of operation of the control assembly and cables.
Picture 1: The top-most lever controls the mode and temperature: OFF - Outside air, compressor off, blower off VENT - Outside air, compressor off, low speed blower COLD - (Above and slightly left of COLD) Recirculated air, compressor on, low speed blower COLD - (Above and slightly right of COLD) Outside air, compressor on, low speed blower
As the temperature lever is moved from COLD towards HOT, some air is sent through the heater core. Midway between COLD and HOT, the compressor turns off.
HOT - Outside air, all directed through the heater core.
Although the service manual states that the blower will be on low speed in any position other than OFF, my control assembly does not have the blower switch to activate the low speed mode. The blower is completely controlled with the FAN switch.
The middle lever controls the outlets: UPPER - All air is directed to the dash outlets (center outlet and left and right ball outlets) LOWER - All air is directed to the heater outlets (lower outlets and defroster outlets)
The lower lever controls the defroster outlet: OFF - All air is directed to the lower outlets DEFROSTER - Air is divided between the lower outlets and the defroster outlets DE-ICE - All air is directed to the defroster outlets.
Picture 2 shows the levers and control cables from the underside of the control assembly.
Picture 3 show the control assembly and cables connected to the heater case and ducting. The upper (temperature) cable is 44 1/2 inches long and connects to the temperature door arm at the right/rear corner of the heater case. The temperature cable is also attached with a clip at the left end of the defroster distributor. The middle (diverter/outlets) cable is 36 inches long and connects to the diverter door arm at the front/center of the heater case. The lower (defroster) cable is 29 inches long and connects to the defroster door arm at the back of the defroster distributor.
Picture 4 is a close-up of the defroster cable, taken from the back.
Picture 5 is a close-up of the diverter outlet cable (on the left) and temperature cable (on the right). Note that each of these cable mounting brackets have slotted holes so that the cable position can be adjusted. I adjusted mine so that the doors just reaches the end of their travel when the associated lever is in the left-most (OFF or UPPER) position. Also note that each cable end should have a round cable retaining nut to keep each cable on its arm, as is shown in picture 2.