HVAC warm air disconnected. New issue?

[Rover Rover]

Correct me if there is another thread on this, it seems that somehow (what I can assume is) a hose carrying warm air has disconnected and my passenger side vents no longer pump warm air. Furthermore, I can hear a hissing just under the glovebox area when I increase the warm air settings on the hvac. Coldest temp settings no issues, hissing goes away. Anyone know if this is an easy fix, or has anyone come across the location of the blend door actuator? Hoping they wont need to remove the whole dash assembly.

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