I am not used to MacBooks. I was checking to see if my fans were running and noticed the fan that is on the Esc Key side blows a little harder than the one on the other side. I didn't see any article on this issue so i do not know if it is anything to be concerned about.
MacBook Pro (Retina, 15-inch, Mid 2015), OS X El Capitan (10.11.5)
The fans are always on, yes. Their default speed is typically about 1900-2100rpm but each fan is independently controlled so their speed is not synchronized. It will also increase (each fan independently) as system temperaruee sensors pick up increasing heat from components.
I have iStat menus on my MBP and it shows the fan speeds - one fan is often running a few to several hundred rpm different from the other, so it's quite normal.
The fans are independent, so there's no requirement for them to run at the same speed. I wouldn't be worried.
My experience with my 4 MBPs has been that the two fans operate within a very few rpms (2±) of each other.
Ciao.
Do Macbook Pro fans run at the same speed?
