Yellow AC vacuum line

[Blueinfan]

Hi All,
Trying to figure out where this vacuum line goes. I have looked n can’t find a connection for it

 

[Mustang5L5]

Drivers side of the HVAC center stack there is a vaccum canister that moved the center flap that controls air to the defrost.. there’s a port on the vac canister and the yellow line connects there

 

[Mstng93SSP]

And if I remember correctly it's a pretty good reach up in there to hook it up.