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Q: whining noise on 2002 GMC Yukon XL Denali

What makes a whining noise while driving?
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Any bearing or bushing in the vehicle (and there are a lot of them) can make a whining noise while driving.
Can you elaborate a little more on what defines a "bearing or a bushing in the vehicle". I have no experience with cars, and am just being forced to learn some stuff about service repairs. What causes the whining noise. What is it a symptom of? Could it be caused by a simple maintence that was not conducted that forced this to be a result of such negligence? Like for example, if I never changed my oil (hypothetically speaking) and this was a result that could occur for not changing my oil (I'm sure it's not-I'm hypothetically speaking) what could you accurately portray if you can even reference this to a maintenance procedure never conducted. Perhaps air filters? Couldn't this be a simple maintenance issue that developed something else?
Bearings and bushings are mechanical devises designed to allow a metal shaft to turn freely, with very little friction. The most common types of bearings are "ball" and "roller" each function the same way. The balls or rollers are housed between an inner and outer case. The balls or rollers allow the inner and outer cases to turn relative to each other with very little friction. Grease or oil would lubricate the bearing, further reducing friction. A bushing is a soft metal cap which a metal shaft will spin inside of, grease is generally used to reduce friction. The amount of pressure the bearing or bushing is subject to is called the "load". Bushings are generally used when the load would be light and bearings are used when the load is greater.
When all is well the these bearings and bushings do their job with very little noise noted. When a bearing or busing fails, most commonly to or lack of or contaminated lubrication, unwanted noise will be generated. This generally a whine type noise and is probably what you are hearing.
Lack of service can sometimes cause bearing failure. Failure to change the engine oil will often result in failure of one of the engine bearings. Failed bearings can also be a design flaw - the bearing used may not be robust enough to handle the task given. Some bearing are "sealed" and require no maintenance. Only after the cause of the noise is known can it be determined if the failure was a maintenance issue or not.
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