Have you checked to make sure you have vacuum to the controls? It's possible the vacuum line isn't connected. I too have a 1980 squire like yours but I've removed everything and installed a V8 under the hood. I'm just trying to remember where the vacuum lines were routed. If you happen to need that control I have the one out of my car and I know it's in good working condition. The vacuum line should be connected to the intake manifold and go across the firewall to a one way check valve. From there it goes through the firewall to the control panel. Also at that point on the firewall it goes from the check valve to a vacuum canister. A leak anywhere in the system will stop the doors from working properly. I'd give all the vacuum lines a once over to make sure everything is ok.