Literally just figured this out. I have a Samsung Ativ Book 9 (i7), and since the update with Cortana, the fan has been revving up and down constantly - every second it goes from 50% to 100% fan speed when usually the fan doesn't come on at all, and if it does it comes on at about 30% speed for two or three seconds and turns off... Anyways, uninstalled just about everything because it was driving me mad, and disabled literally everything I can think of, still did it from the moment I turned the computer on and even before I signed in. Found the culprit:
CORTANA. And it didn't work just to turn her off in the settings... Because she was still running under task manager, what I did was fiddle with the security settings to take ownership and set permissions to modify files under Cortana's file location, and I renamed the 'core' dll so that it wouldn't function. As soon as I did that, fan turned off, and after I restarted it now works as before.
I'm extremely relieved. Hope this helps people reading this too, because I haven't seen any proper write ups on this save for one other person on another forum which gave me the idea.
01-06-2016 02:05 AM