Why is my iMac running so hot?
Why is my iMac running so hot?
iMac 21.5″, macOS 10.12
Question marked as
What year model iMac?
https://support.apple.com/en-us/HT201634
Open your Activity Monitor and look to see what Processes are running.
https://support.apple.com/guide/activity-monitor/welcome/mac
Shutdown and unplug the iMac. Then check the bottom air intakes and rear exhaust port(s) to see if they are clear and dust free.