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Your AC switch is off. Anyway if the AC switch is on and the climate control is not flowing the cool or heat to any of the sides then it means that the AC nozzle is leaking and the pressure is just working into straight direction instead distributing to the switched position. It's a mechanical problem and not electrical at all
Based on the limited information provided, it would appear you have a bad climate control control board. This controls all heater/AC functions including climate control. If you're unable to change temperatures and/or fan speeds, the board is most likely bad and needs replacement.
if it was a vacuum leak it would not do it intermittently, first you should replace your blower motor resistor to correct the only working on high fan speed and the reevaluate the a/c it could be affecting the climate control
The pontiacs have an issue with the ignition switch, I have a 2001 grand prix that did the same. The ac fan would only work on 5 and the headlights would go off if on 1-4 replace the switch and all is fine.
Have you checked the fuse under the dash. You can run power directly from the battery as you did to test the blower just make sure you use a high amp rated switch and make sure you install an inline fuse rated no more than ten amps if you use say 14 guage wire. Let me know how it goes good luck.