My MacBook Pro is overheating with no diagnostic errors

I suspect the Logic Board is bad. The Logic Boards on the 2019 model tend to have a higher rate of failure compared to older models. Unfortunately the clean install of macOS destroyed any Kernel Panic logs that may have better confirmed the diagnosis and possible component on the Logic Board that is failing.

Personally, I would not spend any money on repairs for this laptop due to it having a some known design & manufacturing defects (butterfly keyboard & Display cable issue), plus the higher incidence of Logic Board failures. Besides the bad Logic Board, the battery has a cycle count of 641 which is getting up there so a battery replacement will likely be needed in the near future at another $250 US cost. The money spent on repairs would be much better put towards a new laptop.

I suggest posting the free EtreCheck report using the Additional Text option when posting. The report does not contain any personal information, but there are important details that it will provide.

• The failing Touch Bar could be causing Kernel panics and will be noted in the report.
• It will show excessive CPU usage that could be the cause of the heat.
• Processes that are running on startup that could be consuming valuable resources.

Using EtreCheck - Apple Community

Before posting this report, it is best to remove apps from these categories that are known to cause problems with the OS, if you have any installed:

• Cleaners
• Optimizers
• AntiVirus
• VPN

I believe your question "why is my macbook over heating" cannot be reliably answered on this site. All we can do is speculate. Given everything you did, Apple's conclusion is probably correct.

Yes, you might be able to turn on the Mac, but it's restarting for reasons that may not be determinable.

The flash memory should not have had an error to begin with. Yes, you were able to reinstall macOS but whatever failure caused that error to begin with is likely to remain.

I know that's probably not what you want to hear but it will be difficult for any of us to find fault with Apple's diagnosis. Unlike your fellow Apple product users on this site, Apple also had the benefit of a hands-on inspection and more in-depth tests than Apple Diagnostics is not designed to accomplish.

You did not ask, but should you spend $682 on a five year old Mac? That's a good question, but only you can answer it. Considering it includes a battery and everything else to make it work, guaranteed, it's not a bad deal... but that's just my opinion.

Let me answer for the heat,most of the time the heating up of our apple products sometimes comes from us,maybe we are using an old device that cannot suit the speed of servers that is being used to run apple IOS,or we use third party apps that are not approved so with it your iPhone will have alot of work protecting your security system,from being accessed by outsiders also your iPhone will be able to work alot trying to diagnose what’s safe for you and what’s not safe,and that process you will find the heating effect.

There are no overt indications of anything hardware or software-related problems in that report. I would not expect there to be any, given what both you and Apple did.

It's completely unrelated to any heat-related problems, but 250 GB is a little on the lean side though. It might make the difference between wanting to invest in a five year old Mac or in a newer one with a more generous amount of storage.

Again... most of this is a decision only you can make.