There are a few ways to check CPU temperatures ... "Idle" refers to your processor's temperature when you're not really using ...

Idle Temp: This is when you're not stressing your CPU with a PC game or application, so just using Windows. This temp will be ...

The mechanism of CPU fans is pretty straightforward. They keep a periodic check on your PC’s temperature and get turned on and off accordingly. Every PC has air vents to allow the heat to escape.