I have a MBP late 2011 which has all of a sudden started to run hot, earlier it always had a low temperature of around 47 - 60 degrees Celsius, now it often runs at about 75-90 degrees Celsius even without any particular CPU heavy work. The MBP has 8 GB RAM and an i5, 2.4 GHZ processor, and is running High Sierra. The MBP was fine on High Sierra earlier. When I used TG Pro software it first said at the Fan diagnostics section that the fan didn't appear to work normally, I reset the SMC and it resolved that error message, at least so far. I once had the fan stuck but I fixed that, now the fans are running (somewhat). First when this problem started the fans only run at slow speeds all the time, around 2000 RPM, but now it picks up speed when the temperature gets hot, but it seems the fan is slow to respond to the temperature rises, and it seems it doesnt respond early enough but instead the fan only increases speed after the temperature has gotten really hot, and also it doesn´t take the temperature down low enough. I have no programs or processes that is using much CPU or memory according to the activity monitor, actually the CPU often uses only around less than 10 % and memory often uses around 4 GB out of the 8 GB available. Any ideas what can cause this problem all of a sudden? And any ideas what to check or do next? I find it strange that it happened from nowhere? Some help and ideas is appreciated.