System is over-heating! Is it my PSU

I have a 2017 27” iMac (9.1) That I love and refuse to get rid off.

It has had the above described issue: It runs normal for about 25 minutes after which the upper left area behind the screen gets hot and the fans kick in really loud - it then runs for another 5 minutes tops.

The computer than gets so loud and hot that it freezes. Only shutdown and cool down allows me to turn it on. The heat appears to come from the top area where the power supply is located. Has anyone resolved this issue? I would appreciate any help.

thank you

Livia

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Review this teardown iMac Intel 27" Retina 5K Display Teardown you system is very similar. Can you identify the location of the heat referencing the first image in Step 7.

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