So im guessing it's defaulting to the windscreen vents?
Behind the dial is a "loom" of vacuum lines.... chances are, one of them has popped off... maybe even split.
Take the control panel out (might have to remove dash?? not sure, never worked on an AU) and investigate where the leak is coming from. Will (hopefully) be a matter of popping a vac line back on, or removing/replacing/repairing damaged section.
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