Aloha M,
The fans are really doing some hard work on my MAC, even if the project that I am working on isn’t that CPU-heavy…
Similar fan thang happened to me when I upgraded from Yosemite to El Capitain.
Resetting the SMC and Pram (a couple of times) helped to get things back to normal.
Might work for you as well.
Here is how:
Good luck!
{‘-’}