Have owned 2 2006 altimas and both have had roaring noise like a wheel bearing going out in right rear

Question edited to what I think you thought you were saying.
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Yes, almost certainly a wheel bearing.

https://www.google.com/search?q=2005+Nissan+Altima.+Roaring+sound+in+rear+when+driving

Could be a bad wheel bearing if it's a roaring noise. Or possibly a tire noise due to uneven wear

In my 2005 Nissan Altima I experienced a roaring noise from the rear of the car. It ended up being the rear wheel bearings needed to be replaced. It appears that this is a common problem with Nissan Altima's & Maxima's of varying years even with fairly low mileage. This might be your problem.

yes the roaring noise is a bad wheel bearing-have it replaced and then have a front end alignment done-cheers Denny

a wheel bearing can make a roaring sound from the rear wheels feel the tires for a rough tread if they feel smooth then jack it up and spin the rear wheels you might hear the noise while spinning by hand

THIS NOISE IS CAUSED BY A POSSIBLE WHEEL BEARING
WHEN YOU DRIVE THE VEHICLE YOU SHOULD HEAR A ROARING NOISE AND AS YOU GO FASTER THE NOISE WILL GET LOUDER AND WHEN YOU TURN THE WHEEL FROM SIDE TO SIDE THE NOISE WILL FADE IN AND OUT. THIS IS AN INDICATION THAT THE WHEEL BEARING IS BAD.
ALSO ANOTHER WAY WOULD BE TO JACK UP THE FRONT OF THE VEHICLE, BLOCK OFF THE REAR WHEELS SO THE CAR DOES NOT ROLL BACK ON YOU, THEN PUT THE CAR IN NEUTRAL AND GO TO THE WHEEL PUT YOUR HAND ON THE STRUT BASE AND SPIN THE TIRE WITH YOUR OTHER HAND YOU SHOULD FEEL A GRINDING NOISE. IF SO THE WHEEL BEARING ON THAT PARTICULAR SIDE IS BAD AND IT NEEDS TO BE CHANGED

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

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.

If it's a scraping sound, when does it happen? If it's when you hit the brakes, then it's likely your rear brake pads/shoes are down to the metal and are scraping. This can happen when you're not hitting the brakes, however. Bad wheel bearings are usually a moaning/roaring sound that increases as road speed increases. Ditto that for differential bearings - if they go out, you usually get a roaring noise that increases the faster you go.

check the mounts for the shock absorbers