Got the controls working. The white vacuum line under the hood completely rotted out so the system never had enough suction to operate the diaphragms to move the dampers.
Great tip! When vacuum leaks are indicated, search out and correct the condition. Excess air leaking into the system will upset the fuel mixture and cause conditions such as rough idle, missing on acceleration, or burned valves. If the leak exists in an accessory unit, such as the power brake, the unit will not function correctly. Or Air Conditioning when in MAX mode may switch to Defrost.