Corvette, 1985, lost vacuum to

look for a vacuum pod or tank under the hood. this is most likely where the interior vacuum controls get the vacuum. Does the pod have a line that connects to the intake manifold, or the brake booster? It should., if not find missing vacuum line and repair. Follow the other vacuum line from the pod to the interior, (it is important to find the line going to the interior, as there may be more than one at the pod) is it connected to the controls? it should be. Here is a simplified verbal schematic... vacuum from engine to pod, vacuum from pod to vacuum controlled devices. GM often color codes the interior vacuum lines and that makes them easier to follow under the dash.