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The vac line runs from one of the ports on the plenum (rear RHS ) to a one way valve by dist.
Rear port of valve joins to a plastic line( very brittle and easily broken ) that is in the wiring harness on firewall and goes inside to HVAC controls.
Side port has a rubber line T'ing off to cruise control and continues along wheel well to vac ball under drv side headlight.
I checked the hose at the circular tank and I have suction and I check at cruise and I have suction, but my cruise doesn't work and neither does the a/c door. I'm so confused. Sorry for my lack of intelligence. I'm 16.