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Front wheel hub bearings are very common problems with this particular vehicle. Try jacking the vehicle with the front wheels off the ground. Check for excessive "play" as you wiggle the front wheels while holding the tire at the 9 & 3 o'clock position, then 12 & 6 o'clock position. If the movement detected is the same at both positions, replace the front wheel bearings.
Note: This test also allows you to check for worn tie rods and ball joints. Replace as needed. The droning sound points to bad bearings, though.
If the noise is only when the vehicle is moving it sounds lek you have a bad wheel bearing. You can inspect ford move ment or play shaking the tires up and down and left to right while lifted up on hoist or jack. If there is no movement doesn't necesarily mean the bearings are okay, however if there is movement in bearing replace and drive again. Antoher way to determine Which wheel bearing is bad is to drive and turn to the left, if the noise gets louder than it mens the rightside wheel bearung is bad. If you turn to the right and noise gets louder replace driver side front wheel bearing. Also Rub your hands across your tires, does it feel wavy or uneven, you could have cupped tires, I DON'T KNOW HOW NEW THEY are but cupped tires will also make this noise. One way to see if it is the tires is to do a rotate If noise changes at all then you no its a tire causing noise. Hope this helps.
I would just replace the bearings, They're not that expensive and they're quite easy to replace. After replacement, if it happens again on the same wheel, you probably have a bent semi-axel. I had this exact problem on a '93 200tdi disco.
The problem is most likely a damper door actuator that has a stripped gear. I replaced mine in my Explorer and it appears to be a common problem. To replace it you must remove the side panel which is held in by the door seals and spring clips. This will expose the rear a/c unit. Then you must remove the bolts securing the a/c housing to allow you to pull the housing away from the fender to get access to the actuator. The actuator is bolted on and will require a small socket to remove it. You can hear and feel the actuator thumping to determine which one it is. When replaced, the actuator shaft must be aligned with the damper door which is inside the housing. The part number for mine was YL5Z*19E616*AA and lists for $68.18 at the Ford dealer. I found it later online for $35.
Take vehicle to a shop and rotate tires and see if sound relocates. Without disassembly, chk for wheel movement. push and pull on wheel at top and bottom. then turn the wheel to feel or hear roughness. If they are bad enough to growl you will know it. Any doubt past that, Better safe than sorry have them visually inspected