High CPU and GPU temperature, high fan speed, low activity Macbook Pro early 2011 model - 13" - running El Capitan. 

I've been seeing other people reporting this left and right and mostly they don't look at the activity monitor first. I can say I have and my activity on my computer isn't high at all most of the time. 

Here is a screenshot of a typical situation



I did SMC reset, PRAM reset,... all to no avail.

Looking at this Ask Different post it says temperature sensors may be defective. So I ran the extended hardware test and it showed 'No troubles'. Can temp sensors still be defect despite the so called no troubles from the hardware test?

I also booted into a clean install of Linux and that's where I will have the loud fans as well while there is hardly any activity at all. 

EDIT: almost forgot but I did clean out the dust from and around the fan.

EDIT: Here is also a screenshot from the Intel Power Gadget;
Since you've established that you don't have the problem in Safe Mode, but still do after logging in normally again, then it's time to investigate login items, fonts, and kernel extensions

Investigating login items, fonts, and kernel extensions

Let's start with Login Items:


Startup normally
Go to System Preferences > Users &amp; Groups
Select the Login Items tab
Take a note of your Login Items 
Now remove all of them by highlighting them and clicking on the - button below
Restart your computer


Now your Mac will boot up without those login items loading. Test this and see if the problem persists: 


If the problem goes away you know one (or more) of the Login items were causing the problem. You can then add them back in one by one until you've identified the culprit. Problem solved.
If the problem does persist, it's either a problem with fonts you've installed yourself or with a 3rd party kernel extension. A little more info below:


Fonts:- You can remove any of the fonts you've installed yourself to see if this makes a difference.

Kernel Extensions:- You can open Terminal (found within your Utilites folder) and enter the following command:

kextstat | grep -v com.apple

The above command will list 3rd party kernel extensions (you may need to stretch the Terminal window so it's easier to read). Look for anything you don't remember installing, or something that belongs to software you've removed, or just anything that looks out of place. Remember though, this is a list of 3rd party kernel extensions and therefore any of them could be causing the problem.

A final word

Finally, as an aside, MBP models usually range from about 40ºC (104ºF) to 100ºC (212ºF) depending on whether the CPU is idle or under load. CPU temps (just like ambient temperatures) typically have a bearing on GPU temps too, especially within the extremely confined spaces of a MacBook. 

If you'd like, you can refer to the Intel Mac Temperature Database to see the various temperature ranges reported by users. You can also filter the list by model etc.