Q: Fan running constantly and loudly

You could download and run SMC Fan Control to monitor the fans and temperature. You can use the activity monitor in the utilities folder to check memory cpu power and network usage to se if anything is using to much power, memory or cpu. Or since your computer is new, you have 90 days free phone tech service and one year of coverage from apple. You could use this to find the problem.

Kernel Task is a combination of all the processes running that are root. Google Chrome can be an energy hog. Your fan should not run a 100%.The temp, if you have it set for Fahrenheit, that is a little bit too warm. If it's Celsius,that is very hot.You may have some startup items or launch agents that are causing this. Was the 2012 also running El Capitan? Is everything installed updated? How full is the hard drive?

Have you tried a SMC reset?

https://support.apple.com/en-us/HT201295

An Apple Diagnostics Test may offer a clue:

https://support.apple.com/en-us/HT202731

Ciao.

Quit or force quit Chrome. Does performance improve? Does fan speed decrease? If so, as advised by my ginger, Chrome is the culprit. Otherwise, download etrecheck at the link below, and post back with test results.

http://etrecheck.com

Well, Chrome certainly appears to be the culprit in that report. I would suggest using a different browser (Safari, Firefox) to replicate the same surfing steps. If the fan remains quiet, and you still wish to use Chrome, it may be worth reinstalling it.

Hi Shastings,

I have a:

MacBook Pro Mid 2015 ( had it for 2 weeks )

2.8 GHz Intel Core i7

16 gig ram and 1TB internal

Basically the best laptop on the Mac market today and it runs VERY hot and VERY loud nearly all the time.

I have a 30" Cinema display plugged in through Thunderbolt and a 24" HDMI monitor

1 x 3TB thunderbolt drive and 1 x 3TB USB3 drive for backup

I am having the EXACT same issue you describe and more with the fans.  It appears though I have done a lot more troubleshooting so far with both Apple and Adobe.  My system is running less than 5% CPU right now, but my temp is 126F and fans running at 3000rpm all the time when idle.

Here is what I have come up with:

1.  It appears that my 30" Cinema display causes the video card to heat up and thus makes my machine run at 126F when idle no matter what.  The temp will drop to 117F idle when not plugged in, but either way, the fans will rarely go below 3000rpm according to SMC Fan Control.

2.  The CPEhtmlengine issue of Adobe was causing the main issue.  You can read about it below:

https://forums.adobe.com/thread/1961935?tstart=0

https://forums.adobe.com/thread/2097750?start=0&tstart=0

So, I got on with top Adobe tech, they remoted into my machine and put in the patch for this issue.  They say they are working on a solution that will come out in the next version of CC.  But, this solved the issue of this file taking up more than 100% CPU when Photoshop, Illustrator, InDesign, and Dreamweaver running.  It does happen in Muse too, but the fix for this is to ALWAYS have the CC Libraries panel turned off and then it stops using so much CPU.

3.  The Chrome issue is also a culprit, but I found if I turn off auto plugins and only allow them when needed, the CPU of Chrome drops a lot, but the Ram usage of Chrome is crazy.  Over 1 gig just for a browser.... WFT Google?

4.  The Kernal_Task also uses over 1gig of ram right when the system starts. WFT Apple?  Why would you need 1gig Ram just to start and run the OS?

5.  The system right when you start the machine jumps to 140F+ and the fans run 6200 rpm for 2-5 minutes with NOTHING running.  When I launch Activities all I see is a task called "mds_stores" writing over 1gig of data to the HDD on start up.  Research shows this is a spotlight scan, but why would it cause the system to overheat and the fans to go full speed every time I restart? Also, why is it showing 1gig data transfer on the Drives panel for this time frame right on start up?  I need an answer on this...

6.  Just so you know that I have FULLY trouble shot this, I swapped this machine with another brand new one in the store with Apple Genius people ( since they thought the issue was the internal SDD) and migrated over all my stuff in store.  Smae issue occurs with this machine.  I am a 20+ year MacHead and have built dozens of machines over the years.  I have never seen one do this right out of the box, twice.

In conclusion, If I don't run the Cinema display, and just the HDMI, the machine is less hot (117F), but still runs hotter once ANY software is running on it.  Performance is fantastic and I have put it through it's paces with numerous 1080p edits, over 2 gig billboard designs in Photoshop, large Muse projects etc., etc. since I have owned it and it handles all, but it sounds like a jet engine to do it.  When I monitor the CPU, even when using Photoshop and Muse, I am less than 10% CPU nearly all the time (even right now just running Chrome) and the fans are over 3000+ rpm ... way more the moment I actually task something to open. I am VERY concerning this system will not last my normal 5-10 year lifespan of every mac I have ever owned with the system and fans this hot all the time.  It NEVER cools down to the documented 95F and 2000rpm, ever since I owned it.

I have a 2011 Mac Tower (loaded to the nines) and a 2011 MacBook Pro (8 gig ram).  All with the same latest OS (10.11.4) and same software from Adobe and others since I need to be able to do multiple jobs at once...  The speed is far less than this new machine, but neither of them have this same fan issue when running the exact same software and OS.

This is just crazy Apple.  This is a brand new machine and should handle everything I can throw at it and more.  What is going to happen when I start editing 4K, the reason I bought this machine (just bought a Sony AR7sII and a drone, both with 4K) This Thunderbold drive can handle it, the processor can handle it, Premier can handle it, but will the machine just blow up from over heating since the fans can't run any faster than they do now when running the basics?????

One last thing to note: I have Apple engineers saying they are looking into this, according to the senior tech I have been talking to, and all they have told me is to reinstall, rebuild, reset the SMC and zap the PR.... all of which I have already done (and more with Adobe to insert the patches) plus swapping machines and I still have the same issue.  THIS IS A PROBLEM APPLE!  Please solve it. I have just 2 days to return the darn thing and I REALLY don't want to, but I don't like working with a jet engine when it should be the fine tuned MacBook Pro I expected for this crazy amount of money I paid.

PLEASE HELP!!!!

I did want to make one more note:  My battery life *****!!!  I get 3-4 hours.  Not even close to the advertised 9 hours.  It's all due to the heat and fan speed.

To anyone reading

I have a 2015 MacBook Pro Retina with the latest El Capitain. It has Firefox and Libre Office installed. Other than these -- nothing else has been installed. This computer has been very lightly used.

I was using it a bit this afternoon (no problem) from its battery pack. I turned it off and put it in its case. Two hours later I have switched it on and the fan sound is HUGE, plus the battery power is perilously low (5% left with the warning icon and message to reconnect to a power supply). So I did and the light on the power adapter does not switch on, though it should be fine. I'm guessing it isn't recharging. So I can't really switch the computer on for fear of it running out of power! WHAT GIVES!

Comments?

Apple Support was able to assist above. I had to hold down all 4 of these at the same time:  Shift, Control, Option and Powers keys. The first time I did this and waited, nothing happened. But the second time it booted up as normal with battery power and all other functions normal and intact.

It's still a disconcerting "bug" however.