73 Dodge Dart heat control

The heat control level moves but doesn't do anything. I guess it controls a flap ?? That allows air over the matrix and subsequently heat. The car is stripped before it goes off for a rewire, dash cap off, cluster glove box and radio out... but geeze, no view as to where the cable goes to. I'm again guessing the cable goes to a lever that moves the flap. Has anyone got a photo of this set up so I can ascertain what's what under there? Ive got this manual...but to be honest it's not up to much regarding a breakdown of the Dart set up.

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