Engine cooling to avoid heat-soak when engine is off.
This is my set up in action where I wired the electric fan and the aux water pump to cut on at 91°C even when engine is off to avoid the extremely high temps in the engine. The temps come down in a matter of seconds.
https://drive.google.com/file/d/1VP8hnn6UOBjw-Fb1D9BsJcjD4g8FkB6v/view?usp=sharing
https://drive.google.com/file/d/1ckmyET4KMGXuI8WkP5f1vSvz3muRdhO1/view?usp=sharing