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Q: macbook pro retina 13'' from late 2013 loud fan every time it's on
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Jul 24, 2015 3:47 AMby OGELTHORPE,First try SMC and NVRAM resets.
https://support.apple.com/en-us/HT201295
https://support.apple.com/en-us/HT204063
If no success, run Apple diagnostics:
https://support.apple.com/en-us/HT202731
Also open Activity Monitor to ALL PROCESSES and see if any application is using a lot of resources:
https://support.apple.com/en-us/HT203184
Last is to open the MBP and see if dust and debris has accumulated. This would be best done at an Apple store genius bar since a pentalobe driver is needed to open the MBP.
Ciao.
