If I understand your problem, your heat works, but no A/C. It sounds like the blend door motor is not moving the door to the cool position. This could be caused by a bad blend door motor, or a bad interior temperature sensor. Because you said you heard a banging noise, it sounds like the blend door is stuck. The interior temp sensor would make no noise.
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there is a flapper door that is controled by a little servo motor under the dash that controls the mixture between hot and cold depending on where u have the control set. sometimes when that stuff goes out you may hear a thumping sound under the dash... problem could be in temp control switch, the air mixture control door motor,,, if not......heater core could be stopped up or bypassed underhood
Quite possible a blown fuse. However there is also a blower control module located under the hood near the center of the fire wall. It bolts into the heater box assembly, not to far from the blower motor. You may have to remove the relay/fuse cover assembly to see it. They are known to short out and cause all kinds of problems. Remember though it could also be a simple fuse in that area or under the dash. The worst case here is the whole climate control system in the dash failed.
That sounds like a bad blower motor to me. Try this: Remove the lower panel from under the right side of the dash. Turn your blower motor on HIGH. Look up under the dash behind the glove box and find your blower motor housing. Take your fist and "thump" on the blower motor housing. If the blower starts blowing, replace your blower motor.
The MOST LIKELY cause of your problem is a bad blower motor. The next time it quits, look up under the right side of your dash and "thump" on the motor housing with your hand, if it starts blowing again when you do this, replace the blower motor.
NOTE: It would be easiest to go ahead and remove the lower trim panel from under the dash (even if the blower is working at the time) so access to the blower motor housing will be easy when it quits again.
If the blower is blowing air just fine, but you cannot control the temperature, you need to listen to air coming from the vents while turning the temperature from hot to cold. If you do n ot hear any change in airflow, then you may a temperature door in the dash broken. this is becoming a common problem on the Equinox and Pontiac Torrent,
I take a shoot here you can try this. try pulling the fuse or fuses that go to your heater blower and heater controls. If it stops check your heater blower it may be going bad, if you find nothing there, leave the blower unplugged and try turning your key on and see if you still hear it. If so I would think that the heater control is mess up and open and close the air blend door or you may have a wire shorted out under the dash some where.