Help with AC Temperature Control Cable

Can anyone help with the installation and adjustment of the cable from the dash AC temperature control lever to the blend door lever on the AC/heater box? It's a 1971 Swinger with factory AC. The factory service manual is not making any sense to me - put the water control valve in the full heat position? I thought the water control valve was in the engine compartment. Second question is the "self adjusting clip". Is this a special fastener different from the normal control cable retaining clips?
AC Temp Control Cable - C.jpg