It only blows out air on your feet and defroster vent
The a/c control is electric for temp control and vacuum for mode control when a leak occurs it defaults to defrost floor .look for a leak or broken vacuum line first then control panel then mode actuator.
SOURCE: Heat wont blow through heater or defroster vents
The door in the heater box is most likely stuck. It is located under the dash on the passenger side
SOURCE: Cold Air Not Blowing Through Vents
Your last guess is probably the right one. The deflectors/directors are vacuum controlled and you may have vacuum line either broken or disconnected; these aren't fun to find. I would start under the hood and make sure the vacuum reservoir is intact (have seen them cracked) and then start tracing hoses from there.
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SOURCE: AIR CONDITIONER WILL ONLY BLOW THROUGH THE DEFROST
you vacumn pipes are perished ,work from the inlet masnifold backwards and iam sure you find a split or perished pipe
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