So i updated some of my software from the apple(top left)>software update option. One of the updates was for the fan specifically. Now once in awhile the fan in my macbook will be loud enough for me to hear. This will last for about a minute or two, then slowly goes back to normal (i.e can't hear it at all). Does anyone know what this is all about?? Is it supposed to be better for my MB?....it was an update (wish i could remember and name of the update, but I can't) and in the description it stated that it would improve the performance of the fan..... If anyone can clear this issue up, I would be much obliged.