How do modern cars regulate temperature so well?

kursplat said
ya, the all fans end up being variable speed thing bothers me too. the site isn't very well put together so a call would be in order to answer a lot of these questions. i don't know why you wouldn't set the fan "on" point just above what ever max temp your willing to see, so they have a chance to turn off, once the car is in your happy zone. since this takes the temp at a very different location form where most people install the temp gauge, maybe that accounts for the thinking... i don't know...

I just don't understand why you wouldn't run a main stream controller. I think what you have there is a guy that knows enough electrical stuff to make a thing, but doesn't have the knowledge of the cooling system to actually optimize it. The fact that the controller runs the fans all the time is a huge mistake that compromises on of the biggest advantages to having an electric fan.