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I had the same problem with my 2007 RX350. Had the tires replaced under warranty because of this roaring noise and still had the same problem. Replaced the original equipment brand tires with a set of new michelins and the noise went away. This was 10,000 miles ago.
That roaring noise should be a wheel bearing. Jack up the rear wheels and spin the tires by hand. You can hear a grinding noise if the noise inside the car is as load as you state.. The only other noise that will be like that is the differental gears inside the drive axle
3 suggestions for you, you may need to check the tire pressure, get a tire alligment done, or you have a bad wheel bearing, usally a bad wheel bearing make's a loud roaring sound going down the road. I hope I have helped you.
Either the alignment was not done correctly or the tread pattern on your new tires are causing the roaring sound. Take the car back to the service center that performed the alignment and ask them about the noise.
I suspect the tire pattern to be the culprit. Maybe you can take the tires back and choose a quieter tire pattern.
I certainly would take it back to the shop that performed the brake job and have them investigate. If it was not making the noise prior to the repair there is a good chance the noise is involved with the brakes. A possible loose brake pad, a sticking caliper(caliper pins may need to be lubed) or any number of things could be wrong.
Sounds like the wheel bearing on the right rear hub may be defective, that would cause the noise if the tires are ok. As far as the fan goes not sure this isn't working as designed.
One of the front wheel bearings are bad. Jack it up and see if one is loose, the noise will usually change if you swerve back and forth while driving. Could also be a rear pinion bearing in the rear axle.
Start by inspecting your tires. Look for uneven tread ware, tire separation (a bubble) on the inside or outside. Then change the fluid in your front and rear differential. This will tell you if you have a gear problem. Change the fluid in your transfer case also for indication of a gear problem.
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