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If central air conditioner turns on but is not blowing through the vents, check the filter. If it is dirty, change it. Change the thermostat into cool, this will defrost the air conditioner.
No power, no air! Simple
you may just be low on freon
Doors in the kick panels or heater box are not closing to redirect the air.
When there is a problem in the vent system it defaults to defrost setting. Check the doors & vac supply
Check for a vacuum leak -sounds like it is starving for vacuum and reverts to the default position
2003 crown vic air conditioning vent dont blow
perhaps because the engine running heats coolant that cycles through the heater core and has air blowing across the aluminum to exchange the heat into the air that is forced through the vents
Jammed blend door or blockage in the ducts if you mean to say air isn't blowing through at all.
If the air vents of the Chevy trailblazer 2004 are not blowing air, have the fuel pump checked.
There are 2 filters you access in the glove box. If they are dirty you get almost no air. Clean or replace them and be amazed at the difference
The most common cause of an air conditioner not blowing air is a plugged filter. Be sure your filter is clean.