I've decided it's time to go ahead with this project.
I'm in the process of ordering a Spal dual 11" thermofan with built in shroud
http://www.spal-usa.com/fans/automat...heets/2052.pdf . The shroud measures 596mm x 413mm and going by the specs for JA627 radiator here
H52 | DENSO International Australia the core size is 594mm x 475mm, so it will be a good fit.
I'm going to use two of these voltage switches to tap into the standard coolant temp sensor.
Jaycar Electronics Voltage Switch One will be used to run both fans in series (for a low fan speed) and then the other will give the fans the full 12v to run full speed.
There's a writeup on how the voltage switch works here:
Autospeed
