I have a 2013 Edge Sport that started a humming sound which is coming from the front of the truck. This started after a recent rain storm that caused flooding on our highways. During the storm I went through a large area of water at around 45mph that was maybe 1-2 feet deep (i could not tell until I went through it). Now when i go over 20mph i hear this humming sound and it gets a little louder the faster i go. The sound only goes away when i go back under about 20mph. It doesnt make this sound while idling or when revving up the engine while parked or in neutral. Any idea what this could be. Money is tight and im hoping its not serious.