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There is a small vacuum hose that runs along the front of the throttle body.Usually gets brittle and brakes .This runs to the passenger side of the firewall this goes to the heater box.without vacuum the valve under the dash can not switch.I hope this helps
Your control doors under the dash are not operating. Don't know if they are cable operated or vacuum operated. You have to get under the dash to find the problem, and maybe pull out your control assembly on the dash to see the problem. Sorry, not much help.
If you cannot change the air flow from the heater vents, defroster vents, to dash vents, etc. as your control switch indicates the problem could be a loose vacuum line. It could have come loose from the engine under the hood. If not you will need to remove the control from the dash and check for vacuum at the control. If you have vacuum there you will need to replace the switch,
the ducts are selected by tiny actuators inside the dash and are small flaps that move to cover holes. sounds like they have broken, dash has to be removed to access the air control box and from there see if they are loose