The blend door control works in every position except dash vents when switched to A/C or vent?

I know ya'll are getting tired of this question but, I've got the car listed above coupe, blend door control works in every positing except dash vents when switched to A/C or vent. Floor works as does defrost. Using diagrams, I found on here I've traced down all vacuum lines and repaired the ones loose or broken. Still having the issue with no air coming out of dash vents when I switch the selector to A/C or vents?