Overheating Apple Support No Solution
My iMac is really overheating. often 90-102ª
Apple says nothing wrong with sensors.
Activity Monitor not too severe, so...
Have you guidance on renewing the CPU Thermal Paste.
I once had this exact issue on a G5 imac and I beleive this INTEL iMac has the some solution required.
Here's what issue I have, shown with iStat: