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sounds like you have a bad blend door motor that is stuck in the middle allowing for all vents to blow air... locate the motor under the dash and remove it. manually move the lever and see if it changes the flow.. check for power at that motor to make sure your getting the signal from the dash then you'll have found your problem....
There are controls in your car where you can control the flow of air to certain parts of your car. Make sure that you have it turned to where it blows out of all of the vents and then the air should come out of the dashboard. If this continues then there might be a ventilation hose that has been disconnected and is not getting air to that part but the other hoses are still connected.
the air flow does not have any thing to do with the thermostat
make sure you had the right cabin air filter and put in the right dirrection
the air flow is control by three devices calls mode door actuators, if this goes bad then you may not have enough air flow to a certain area
Clean the throttle body with throttle body cleaner and blow dry with compressed air or use a rag. Clean it 2-3 times then start the car. Also make sure that the hose fron the throttle body to the air flow sensor is thight and doe's not have cracks in it. (if it has air flow sensor)
in your glove box there should be a trap door with TWO filters in it...they are SIDE BY SIDE, my guess is they are plugged up with ****, evey one cleans one but there is another one to the left...My 1997 venture has air coming out all vents, floor and top of dash...cant find the problem but I left the filter out and closed the little access door in the glove box and it has helped a lot
THE AIR SELECTOR MAY BE BAD BUT THE ARMS ON THE SIDE OF THE HEATER THAT REDIRECT THE FLOW LOOSEN AND WILL NOT OPEN THE FLAPPER, THIESE ARE LOCATED ON THE DRIVERS SIDE WHERE THE AIR BLOWS OUT ONTO THE FLOOR ABOUT HALF WAY UP.