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Mar 12, 2016 7:56 AM in response to cthomas106by den.thed,Reset the SMC, as per > Reset the System Management Controller (SMC) on your Mac - Apple Support
Run the Apple Diagnostics Test, as per > Using Apple Diagnostics - Apple Support
Yes' under extreme GPU and CPU load conditions, it may be necessary for the fan to provide extra cooling.
for example: (siamotainously watching a video and running an App that requires a lot of CPU time)