Sounds as though it is coming from the rear somewhere..totally dependent on wheel speed, not engine related. sounds like a whirring turbine, low pitched..increases as my speed increases, and sort of spools down as i slow...
it did it temporarily last week for maybe 1 minute, and a week before it did it shortly...but the last few days it has been constant unchanging.
a bearing surely sounds like...though i dont know much about these cars specifically, i come from driving a cherokee.
noise does not change whether im on accel or decel or coast or anything..so i dont think its a diff issue...or could it be?
i jacked the car up in the rear and tried rocking the wheels, and got no movement there, which leads me to believe it isnt wheel bearing related...but like i said i am new to these cars.
its a 2000 impreza RS with an automatic tranny