98 2wd vacuum hvac help

I don't have any vacuum going to the actuators for the Max A/C or floor/dash/front defrost. Can someone help me pinpoint where the vacuum comes into the firewall and then backtrack to Vac res/engine?:uhoh:

Diagram below.See the rubber gromet in the diagram, that is where the vac line goes through the firewall. See the vacuum tank, that is under the hood. Follow the vac lines.