2000 Toyota Avalon speed sensitive humming sound.
2000 Toyota Avalon. 180K miles. There is a Speed sensitive vibration which
occurs. It is an obvious humming sound. Usually around 40-60 mph. Nothing
at lower speeds and the sound disappears at higher speeds. The hum varies
with speed and road conditions. There is no obvious car or steering wheel
vibration. The problem was noticed before new tires and brakes were
installed, which had no effect. Wheel bearings were checked, and they are
said to be OK.