Rear A/C Blower working but no air on 2003 Lincoln Aviator

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Rear A/C blower motor located in the back driverside panel sounds like it is blowing but no air coming out of the rear vents? Help, Florida's to hot!!!
(1) Answer
(1) Comments
it may be one of the heating doors which lets the air in the vents.
Where are the "doors" located