On the subject of heater/ac controls. I need the whole mechanism with the cams, levers and all. It is all plastic and one of the two control cables on the left side and up under the dash to the right of the steering column has a metal arm attached to the firewall frame that operates the damper when the control lever is adjusted. This is the culprit that rusted and someone apparently wrenched the control lever and completely tore up the plastic and even seriously twisted the lever. The could well be the problem, BenM above, of the control being stiff.
Anyway, does anyone know of a replacement control unit?