My computer is making a terrible whirring sound.  I don't know why....?

Hello! My computer is making a terrbile whirring sound, and I don't know why....?  I checked the CPU%, and there was nothing over 10%!  I am in confused on why the noise randomly starts up, and then stops.....  Can anybody help?
Thank you!

Good, open Time Machine and make sure that it is up to date (it should be) and then go to the Apple Store and have them diagnose what is making the noise.
(I assume here that Time Machine is backing up to an external drive)

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