heater cable

Been driving the 65 valiant a bit lately and i'm not getting much heat. I had replaced the heater core recently so it's most likely not that (installed new heater hoses too). When i looked at the top of the heater box i noticed that the heater control cable wasn't attached to anything. No wonder i'm not getting any heat! But the problem is I can't for the life of me see where it attaches! The cable that controls the def/floor flap is hooked up but where does the heat control wire go?