Overheating MacBook Pro after Big Sur instal

I have the same issue. MBP 16inch overheating after updating to Big Sur last night. I've restarted many times and still my Mac's fans start while it's sitting idle with nothing running in the background. This is definitely software related.

I have the exact same issue with 13inch MBP and I suspect it has something to do with a process by name kernelmanagerd. I already contacted Apple support for the issue and they told me to reinstall mac os. Even reinstalling mac os didn’t solve the issue. I request apple to fix this issue soon.

After every major upgrade there are processes that occur in the background such as new indexes and databases for such things as Photos or Search. These take time and the system needs to be up and running to resolve it. Try setting system NOT to log out or shut down for a day or so and you should see improvement.

I have MacBook pro 16 , Big Sur do overheat my Pro16 , its crazy , 71 c its minimum temperature im working now , and it eat battery very fast , have no idea what to do , i hope they will solve this problem soon , its very bad

So a quick update for my MBP 16in: After a few restarts my Mac seems to be acting as normal. The OS isn't causing the fans to spin or anything. I've been using it fully for the past couple of days, running apps, creating docs and playing music all at once and it's acting as expected. Perhaps it needed to fully index after the MacOS update? Not sure, but thankfully it's back to normal.

Does Apple have any idea, exactly how long Big Sur will take to create "new indexes" before things will operate as with Catalina? I performed every recommendation to fix the "fan and overheating" issue to no avail. It has been two days since the "upgrade" and the fan still is running for applications that should never cause overheating and excessive fan operation .. I mean .. word processing? .. really? This is terribly annoying. If this is a software bug, as I suspect, when is there going to be a fix .. APPLE???

I think so. As I wrote above, I think there are some problems with certain actions in Big Sur that makes something keep running in the background. It took me a while, but what eventually worked - and this cleared up the hot running, fan, connecting problems, battery, etc. - was:

1. open Activity Monitor (find it in “other” folder in Launchpad) and click top tab “%CPU”. You will see what is using a lot of energy.
2. If this/these are something you can shut down, good. If not, force quit those programs.
3. shut down computer. Anything that will not shut down or gives you a message saying the action cannot be done because something is in use, for e quit. You can force shut down the computer by holding down the fingerprint key.
4. restart after it cools.

good luck!

I have the same issue. My MacBook Pro is 13-inch model A1989 and ever since the update, it heats up just by watching YouTube or sometimes even when no program is running its heating up with the fan noise.

So, pretty much as I advised yesterday. This is known behavior, especially after a major upgrade, that users should be aware of prior to undertaking the installation.

We all need to do our homework so that we know what to expect. After being burned more than once on upgrades I no longer jump right in. Rather, if there are issues that I don't want to take a chance on, I'll wait for a 'dot' update.

I didn't even upgrade from OS 9 to OS X until 10.3 (Jaguar) because printing wasn't sorted until then.

Sorry for the rant but when these types of issues are reported it makes it seem as if the entire OS is no good.

The most serious issue thus far seems to be 'bricking' of early laptops and I'm really sorry for those folks but you need to approach these things cautiously.

Yes. unfortunately, i have same problem over here. I didn’t experience any overheating before with my MacBook pro 16, now i have to deal with overheating issue. I hope a quick software update will fix it.

While my MBP 13" 2019 has no such issues when doing nothing, it has huge issues with doing anything. The fans were genuinely an obstruction to my skype meeting. Opening 4tabs in chrome makes my macbook dream of becoming a helicopter. Wish I hadn't updated. For me this is just one of the 3 main issues that have come from it.

Yeah I've been having the same problem. I've updated since the new software was released, around a week ago, and my 2015 13.3 in. MacBook Pro has been heating and its fans working endlessly although I wouldn't be doing much work on it!!! I used to do more work on it yet it wouldn't do this...

MacBook (Retina, 12-inch, 2017) , same problem after installing Big Sur .

only get the device on, make it getting all the macbook case very hot after 5 min with no softwares launched. and the battery drain very quickly too ! D'=

that wasnt happening with Catalina.

Ok I found out that it probably is because of "Google Chrome Helper" running really intensively. I went in "Activity Monitor" -> double click -> End process. After 5min, the vent went down and it finally stopped

I found this article worked: https://macpaw.com/how-to/reduce-mac-fan-noise

Specifically, I used CleanMyMac to find "Heavy Consumers" in the Optimization tab.

For me it was the Chrome Helper app. Once I closed that the fans stopped.