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I have seen this on GM vehicles before. If you take the temp selector and change it to the middle or to cool it will not let warm air go through the defrost vent. The hot air coming out of the defrost vent is because the heater core has warm coolant going through it- and the user generally has warm selected on the temperature setting.
when your car is in defrost it has an ac cycling it removes the moisture then sends the air over the heater core depending on how warm you set it you can feel warm or cold but the ac is always cycling...ridding the moisture...you need a good ac tech it will be okay...its just expensive going into the heater core if needed...!
If on either heat or AC your not get'n any air out of your vents but can hear your blower motor turning then i would say you need to replace your cabin filter.. it filters the air inside of your vehicle