I havent read about or experienced this problem. Can you describe the sound a bit better? is it constant? Where its coming from?
As for the driver feet blowing. If you take that piece of plastic, Torx 25? screws, under the steering wheel off you can see both the duct lines straight up. The one goes up to vent left of the instrument cluster. The other one has 3 holes in it to blow on the feet. Mine was just disconnected. It just pushes back on. You should be able to see where it goes. Mine fit really loosely on i believe i used some tape to get it to stay in place. There is a screw on the 3 hole one on the door side, the other one is just held in place on its own. Thats where i would start for the floor heat problem.
If thats not the problem, you'll have to research this since i dont care to fix mine. When i switch the air direction between floor, face, defrost or whatever it doesnt blow where i set it. Sometimes it comes out of all vents or no vents or itll just be on the floor when i have defrost selected. i know ive seen threads on this stuff but like i said i dont care to fix it so idk what the cause or fix is.
Ive seen a How to Thread somewhere about the plastic on the blower motor? warps and rubs and you can fix it with a metal screw. I'm not 100% since i read about htis over a year ago but may be another thing to look into.
Hopefully any of this rambling helps atleast get you in the right direction.