humming noise increases in pitch and volume w/ speed
My mother -in -law has a 01 lincoln continental ( I know, wrong forum) it has a humming noise in the left rear that increases in pitch and volume w/ speed. It goes away when I turn the wheel to the left but returns as soon as the car returns to straight. Starts at 20mph and doesnt stop after that. I raised the car and checked for wobble, bearings and pulled the wheels and looked for anything rubbing and fouund nothing. Rotated tires and has same noise ?? Thanks in advance.