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Most of the time you can hear a bad wheel bearing but the only 100% sure way to know is to remove the bearing and inspect it.Most of the time you can hear a bad wheel bearing but the only 100% sure way to know is to remove the bearing and inspect it.
bad throw out bearing
But seriously a knocking as opposed to a clicking would point toward a bad crankshaft bearing.
The clutch Throw Out Bearing is going bad.
I have a 2003 that sounds like it has a bad rear hub bearing. I plan to change it this week. I'll let you know when I'm done.
It is important to know the signs of a bad car part. If an AC clutch bearing going bad, the biggest indication would be the trouble driving with the AC on in the car.
Bad strut? Bad strut bearing? Loose exhaust component? Loose heat shield on catalytic converter?
Just replace it.
If a wheel bearing is bad you will hear a howling noise while your driving.
A grinding or abnormal noise at the wheel is a good sign the bearing is bad. Unload the bearing by moving the vehicle left or right while moving. If the noise comes and goes when doing this, the bearing is bad. The only positive way to verify this is to remove the bearing and look at it. Pitting, scouring, and any other signs of wear indicate the bearing needs replacing. Be sure and replace the race if it is not perfect.
If it's leaking (usually bearing area), not circulating (squeeze top hose) or squealing (worn bearing)
If you hear a noise you suspect is a bad wheel bearing try this. While driving slowly turn the wheel sharply to the left. If the noise goes away your left front wheel bearing is bad. Now, turn sharply to the right. If the noise goes away you right front wheel bearing is bad. The only 100% sure fire way to know for sure is to remove the wheel bearing and inspect it.