Ac Not Blowing Air Through Vents

Does anyone know how to manually turn or make the ac blow through the front vents until i decide that i want to spend the money with nissan?
Ac not blowing air through vents. My issue is that no air is blowing from dash vents when vent is selected. If you are experiencing weak airflow from vents in the house, check whether it is happening only in one vent or multiple vents. Maybe the fan is not fantastic.
The ac will not blow from the dash vents in my 2004 tahoe. The main vent of the vents that faces the passengers blows out nothing. The taurus i have is blowing cold air from the bottom of the car, but not through the vents, i don't know why this is or really where to begin.
I called for an estimate and the guy tells me if he has to open up the dashboard to open up the. There is one room that the air comes through the vent but it is very weak and not cooling the room. It doesn't matter if it is on auto or just fan same thing happens, with heater ok with a/c not ok.
What could be the deal?thx. So the blower works just not when the a/c is on. Inspect both external and internal air intakes located at the base of the windshield (external) and at the passenger side foot well (internal).
The reason why i said sometimes is because it stopped working for a day then it would work again the following day. Cold air isn't the problem, and the only place the air isn't going through is the vents in the front. Had some issues with it about a month ago.
Dirty coils can be a reason for an ac not blowing. A faulty blower fan can make the car ac stopped working suddenly. Air only appears to blow out of defrost vents at windshield when vent is selected.