Air conditioning is not coming thru vents of 93 suburban what can be problem? Compressor on and charged
Most likely the mode control servo motor is stuck or the mode door is jammed. With the engine off and the key on and the fan on the lowest setting try switching the modes from foot to defrost and back to AC vents too see if it will reset itself, if that fails then disconnect a battery cable for at least 5 minutes, then reconnect the battery cable and run it heat controls through the modes. If that fails then it's time for the pros to step in as repair can get to be a challenge especially if the heater assembly has to be removed to repair the system.
Check to see if the evaporator blower fan is working. Along with that, check your cabin air filter and change it or clean it regularly.
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