Why is my mac making a strange noise?

A couple of hours ago my mac started making a really weird noise.. it kind of sounds like a lawn mower.. It fades away every so often and then comes back...
I think it might be the fan.. but my mac isn't hot underneath... please help!!

The only noise maker on a rertina MBP is the fan.  Since you do not have a pentalobe driver that allows you to take the bottom plate off, bring the MBP into an Apple store genius bar for a FREE evaluation.
Ciao.

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