The fact that you accurately described the problem ("coolant gets sucked in buy radiator") means that you understand how it is supposed to work, so you know what the problem is. If no vacuum is being formed as the radiator cools, that means that it is able to suck in air somewhere. The fact that you have to keep adding water corroborates that there is a leak somewhere. You just have to find the leak.
If you don't see any wet spots anywhere, I would first suspect the radiator cap.
Fill it with water, drive the vehicle until it is warm (pressurized), and crawl under the front end looking for dampness and/or drips. If the problem is not immediately apparent, try a new radiator cap. Also inspect the hose from the reservoir to the radiator for cracks or loose fittings. The leak could be from the radiator or the engine.
The noise near the glove box is most likely vacuum leaking from an accumulator or actuator on the cabin ventilation system. I suppose it could be your water leak if the water is finding its way to a drain rather than to your carpet. You probably would have smelled hot antifreeze in the cab if you had a leak under the dash.