I know this is a very old thread but I have a recent experience with this. I picked up a used Pro and it was so loud I needed noise cancelling headphones to use it. It would also throw messages that it was too hot and would crash.
I went through the standard videos and articles that basically said "clean the fan". This did not work or help in the slightest. I got brave enough to pull the whole thing apart and found the true issue.
Whoever put the thermal paste on these things did it completely wrong. The paste was smeared all around the CPU with nothing on it. I ordered some new paste and put it on properly and every noise issue was resolved. I think it may even be quieter than the PS4 Slim now.
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