This happened to me not long ago to start with it sounded like air coming in through a gap in the window but within a few days it was sounding much rougher a bit like the sound it makes when you hit a few branches of trees and they screech along your hood.
Power steering or wheel bearing?
Tires can make road noise Pinion bearing? Wheel bearing?
A grinding noise form a wheel is usually caused by a bad wheel bearing.
In my experience, any noise coming from the wheel bearings is an indicator of wear - and ultimately a repair job in my future. See "Related Questions" below for questions/procedures on Windstar front wheel bearing replacement.
worn or bad wheel bearings will make noise (grinding, humming, etc)
A grinding noise in the wheel will either be caused by worn brake pads, or a defective wheel bearing. Remove the left front wheel and inspect brake pads. If the brake pads are OK, you will need to remove the caliber and inspect the wheel bearing.
Strut, ball joints, roll-bar coupling, wheel bearing
Sounds like a wheel bearing to me.
Probably the bearing in the left wheel is damaged.
It will rumble and increase with speed.
if it sounds like growling it is a wheel bearing.
Jack the car up so that wheel with the bearing in question is up off the ground. Grab the tire on the top and bottom and rock it back and forth. There should be little or no play back and forth with the tire. If there is then that bearing should be replaced. Usually a bad wheel bearing will make a noise while the car is in motion. The noise may get louder during turns. Also, withe the car jacked up spin the wheel. The beraing may cause clicking noise or rotate in a jerky way. I have seen situations where the symptoms of a bad wheel bearing were not pronounced but the bearing was in very bad shape (split rollers split race. Investigate any symptom promptly. The bearing may cause you to loose a wheel or cause the wheel to not turn! Bad wheel bearings usually make noise while driving, try to listen to your car closely.