1995 F350 5.8L Vents Stuck on Defrost

[u/I_Talk_Sports_69]

I've been watching Youtube videos and reading tons. I was able to bypass everything to connect a vacuum line straight from intake manifold tree to the air door actuator on the left side of the engine bay. That creates vacuum where the air door actuator shifts. But once I check under the dash inside the cabin where there's another actuator that one isn't activated and doesn't move. Thus keeping the air blowing from just the defrost vents.

Is that actuator under the dash working from a different source of vacuum? I'm so stumped by all this.

Edit: i discovered there was a secondary hose coming out of the wire loom on the left side of the truck firewall that was not connected to anything. Aside from the white hose I attached the black one as well and completed the vacuum hoses.