Here's why:
* Location: Wheel bearings are located in the front wheels, so a humming sound emanating from the front is a strong indicator.
* Speed-Related: Wheel bearing hums usually increase in pitch and intensity with vehicle speed.
* No Other Symptoms: The fact that driving, handling, and braking aren't affected rules out many other potential sources like engine, transmission, or suspension issues.
However, other less likely possibilities exist:
* Loose pulley: A belt driven pulley, especially the alternator or power steering pump, could be loose and making a humming noise. But these often have other symptoms like squealing or a change in accessory function.
* Tire imbalance (unlikely): While you mentioned tires are good, a slight imbalance *could* cause a hum, but usually it's accompanied by vibration felt in the steering wheel or seat.
Recommendation:
Because wheel bearings are a safety-critical component, I strongly recommend taking your Buick to a mechanic for a proper diagnosis. Ignoring a wheel bearing hum can lead to catastrophic failure, resulting in loss of control and a potential accident. A mechanic can quickly pinpoint the source of the noise and recommend the necessary repair.
