Announcement: Upgrade to macOS Mojave

With features like Dark Mode, Stacks, and four new built-in apps, macOS Mojave helps you get more out of every click. 
Find out how to upgrade to macOS Mojave >

Looks like no one’s replied in a while. To start the conversation again, simply ask a new question.


Question: Fan running constantly after High Sierra 10.13.4 update

I recently updated to High Sierra 10.13.4 and ever since, the fan is running on full speed, all the time. According to the Activity Monitor, the CPU is used less than 15% and the machine is not running hot. The fan stops briefly when I turn on Siri, but starts again after a few seconds.

Anyone else?

MacBook Air

Posted on


Page content loaded

Apr 12, 2018 4:59 AM in response to jrortveit In response to jrortveit

If you are unable to correlate the fan activity to any particular app or process, read the links provided under "Learn more" in See how apps affect Mac performance, battery runtime, temperature, and fan activity - Apple Support.

Apr 12, 2018 4:59 AM

Reply Helpful

Apr 14, 2018 4:09 AM in response to jrortveit In response to jrortveit

wow-i just had this happen on a less than 1 month old MacBook Air and searched for help! It sounded like it was going to take off. After following the link below from John Galt, I opened activity monitor and it was my running Pages that was causing the increased CPU usage. I had never used the program before and may not use it again after this. Mac went back to normal as soon as I quit out of pages.

Apr 14, 2018 4:09 AM

Reply Helpful

Apr 24, 2018 9:51 PM in response to jrortveit In response to jrortveit

I too had this problem after installing 10.13.4 update. It was driving me nuts. Finally, after reading many comments, I went to Activity Monitor and found that my Winclone app Backup Menu Item (option in the menu bar) was sucking up my CPU usage. I turned off the menu item, and the fans are now silent. Hope this helps.

Apr 24, 2018 9:51 PM

Reply Helpful

May 18, 2018 10:46 AM in response to jrortveit In response to jrortveit

I´m able to correlate that Finder is becoming unresponsive ~1min into any command while Safe boot works fine. It is definitely a GPU issue. I´m running MBPro mid 2015 with full power, clean install 10.13.4 and the only way to interact with the system is to use Path Finder to force Finder to quit at login. Every app and pref pane that requires interaction with the builtin finders browser becomes unresponsive for ~3-5 mins, sometimes completely. It helps to disconnect externals USB drives, but as my work largely depends on external storage, macOS becomes quite useless.

TLDR = Try Path Finder and tell it to quit finder and PF creates it´s on desktop. I´m currently running PF8 (beta) and it´s very fast, but some minor glitches and update from day to day. It crushes Finders performance though and it seems like my laptop is allergic to anything Finder related right now.

- oh yeah... My fans are completely bipolar. I can literally track the sound of a software iteration loop and thus far, the only solution has been to boot into safe mode, followed by normal. Safe boot works very well and is sort of what Im resorting to in the meantime. The fans are either SUPER SPINNING or quiet.

May 18, 2018 10:46 AM

Reply Helpful
User profile for user: jrortveit

Question: Fan running constantly after High Sierra 10.13.4 update