I also had a coolant loss recently. I'm going to build
this autospeed temperature switch soon and hook up my fan to it. I'm running a partial grille block too.
How about this for wacky:
My temp gauge goes up to a certain point then starts going
down when it is getting hot. I have a separate new oil temp probe so I know which way things are trending. This is probably age related and perhaps a Toyota speciality. I know in kilns the bi-metal temperature probes change over time so you have to test them every once in a while.
Good idea, this alert.