Originally Posted by 2ksleeper

The flex-a-lite fans require the radiator core to be 34" wide where as the stock radiator core in my truck was 28.5" wide. I don't think flex-a-lite make fans to fit the 28.5" radiator but I believe that permacool does. The flexalite fans came with a variable speed thermastat controller that had a range of 180-240f & since I wanted to run my truck cooler than that I basicly copied the way the ls1 fans are wired & run the fans in series for low speed operation & parallel for hi speed operation. The wiring is not too bad if you are use to doing electrical wiring for stereo equipment.