huh, so apparently nothing is over heating. Wonder whats the smell from, and why the PC feels extremely hot..
If the PC feels hot on the outside, it means the fans are not working properly and hot air remains inside for longer than it should.
Note - "hot" is relative. If the air inside is 70°C and the components are around, let's say 80°C, it's kind of normal temperature for them, but a 70°C metal case will feel really hot to YOU.
That being said, if the case fans are working as they should, the air temperature inside the case should ideally be 10-20°C warmer than the ambient room temperature. So around 40-50°C.
I think it would be good if you posted some photos of your PC with the side panel off so we can take a look.
There are several things that could be the culprit of this, one of which is an inverted exhaust fan.
Normally, most cases will have one or more fans sucking air inside from the front (intake) and one fan on the back, plus sometimes other ones on the top which exhaust the hot air out. If your exhaust fan(s) is turned the other way around and sucks air inside, instead, it would mean the air is kept inside and only escapes through the gaps in the case or grills that aren't occupied with fans.
That's the first thing that came to mind.
Other is that the exhaust fan is simply not working (not connected or failed)
Again, if you can, post some photos (possibly some closeups). That would be a great help.