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Helpful answers
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Jun 4, 2016 11:23 PM in response to YWKKby appreciate,An apple article is there you can follow it :Mac notebooks: Spotlight indexing may make the fans run - Apple Support
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Jun 5, 2016 10:24 AM in response to YWKKby appreciate,Go to system preferences > energy saver > open the padlock by entering user name and password > power adapter > disable wake for wi fi net work access .
- With Wake on Demand enabled and your Mac in sleep mode, your Mac will occasionally wake for a brief time, without lighting the screen, in order to maintain active shared service registrations with the Bonjour Sleep Proxy. On some Macs, sounds from the optical drive, hard drive, or fans may be heard during these brief periods.
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Jun 5, 2016 11:52 AM in response to YWKKby OGELTHORPE,Run an Apple Hardware Test:
https://support.apple.com/en-us/HT201257
Note that an error free AHT is not conclusive.
Ciao.