If applicable, you may have a faulty (locked up) fan clutch.
Remove the muffler
the wheel bearing on the vehicle will make a roaring noise when you accelerate the faster you go the louder it gets
The compressor may have a locked rotor in the condenser causing the loud roaring noise. Another possibility is low refrigerant.
Hi. it could possibly be your electric thermo fan.They work when the engine is hot even when the vehicle is stopped
My car was making this noise when I started it up. the noise went away after driving for a while. turnd out I just needed more oil.
is it a stick shift? mine is a stick shift and it got alot quieter after i changed the transmission fluid... google it.
Bad fan clutch!!
That is your bearings. You need to replace them.
Noises have to be heard to correectly diagnoise. It could be bearings, tires or a number of things.
A Toyota RAV4 would make a loud noise while driving if a piece of hardware like the camshaft is damaged or something is caught in the drivetrain. This will result in noise and potentially costly repairs.
Brakes
It could be the rear differential--there was a recall on this back in 2005--hope this helps