Derale 16735 Farenheit Electric Controller Review

My old Flex-lite Adjustable Temperature Controller (Part #FLX-31147) has expired after being connected to a Derale (DER-1627) for almost 10 years. A powerful 12 volt electric fan is on my old 4.0 V-6. After thinking I didn't really need an adjustment and wondering why I hadn't matched the Derale fan control box with my Derale fan, I concluded that this Derale 16735 fan control kit would be a well matched and logical replacement . I was wrong! For some reason it worked as advertised for about 2…