To avoid serious trouble, car malfunction should be found and resolved in the early stages. The easiest way to determine the bearing failure hearing. Damaged bearing produces a characteristic hum, howl, squeak – specific sound depends on the bearing type, its size and where it is.
If when driving you hear the hum, you may have a damaged wheel hub bearing. To test this, post the wheel on the Jack and roll it – in the event of a bearing failure you will hear a hum or crackle.
For front-wheel drive car also check: lock car hand brake post one wheel Jack. Start the engine, turn on fourth gear. Loosen the engine up to about 4 thousand rpm. Your assistant have to listen to coming from the spinning wheel sound. If you hear a rumble and grinding noise, the bearing should be changed. Similarly checks the second wheel. To insure the safety Jack stand under a sturdy threshold.
Buzz can the water pump bearings and generator. To define failure, it is sufficient to open the hood and listen where it's coming from the drone. For a more accurate location of fault need to work the gas pedal, as the sound is sometimes best heard that if you change the mode of operation of the engine.
In that case, if the hum or whine is heard when you press the clutch pedal, you should check the release bearing of the clutch Assembly. The fault can also be in the transmission.
If you hear coming from under the hood squeak or whistle, might have to change the bearings of the generator. It should be noted that a similar sound may be issued when a bad alternator belt tension, or excessive wear.
When a drone is heard when driving coasting, you should check the outboard bearing of the propeller shaft. Final diagnosis is best done, drove the car on the overpass and checking the bearing for the presence of backlash.