Overheating during cam break in

I Hate to be a dick but why would you risk an engine by putting on a flex fan for cam break-in, AND sticking with it two more times when it overheated on the first try?
You know the definition of insanity, right;doing the same thing over and over and expecting different results?
Thermostatic clutch fan. There is a special short shaft version available from Haydon,now. A member here talked them into producing them. Do a search.