MacBook Fan Running Continuously After Upgrading to OS X 10.9 Mavericks

by Michael on January 25, 2014 · 0 comments

I finally got around to upgrading my retina MacBook Pro (rMBP) to Mavericks (OS X 10.9). After waiting (and waiting!) patiently for the 5.3Gb download, the upgrade process was a snap. If only we had a faster connection!


Shortly after upgrading, however, I noticed that the internal fan had cranked up to a rather high speed. This is definitely out of the ordinary as I can’t recall ever having heard the fan running in the past.

And I wasn’t doing anything particularly intensive, just normal web surfing session in Google Chrome. Sure, I had a ton of tabs open, but that’s par for the course for me and not something that should be causing the computer to overheat.

When I felt the case just north of the keyboard, I could tell that it was running hot. Awesome. I finally get around to upgrading only to find that Mavericks is glitchy.

Well, my troubles were short-lived. On a whim, I decided to reset the System Management Controller (SMC) and that solved the problem entirely. No more overheating. And no more crazy fan whirring. Just my nice, quiet rMBP and me. And a cup of coffee, of course.

Want to reset your SMC? Just do this:

  1. Shut down your computer
  2. Plug in the MagSafe power adapter
  3. On the left side of your keyboard, simultaneously press the Shift-Control-Option keys along with the power button
  4. Release all four of the keys (once again, simultaneously)
  5. Press the power key to re-boot

Note: These instructions are for Intel-based MacBooks with a non-removable battery.

The light on the MagSafe plug might flicker or briefly change colors when you do this (mine flickered from green to red and back again). That’s fine. It’s a byproduct of the reset process.


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