I know that they sell a harness, but the wiring seems simple enough. Let me know if I am off track here.

Dual fan setup, one fans power triggered by the Tstat (through a relay), and the other fan triggered by the AC (again, through a relay). Am I retarded or is it that simple?

One more thing, if I do something custom, whats amount of room do I have to work with? Can I use the full area of the radiator? I am thinking about trying to bracket two universal 15" fans together. I am trying to figure out what area is considered usable space.

Thanks.

 

The relays are actually ground triggered at the coil. It is simple, yes. I built my own harness with some Tyco(Bosch) 50amp, resistor supressed relays. Triggered by pin 42 and 33 at the PCM. Allowing for operation just like that of 06 Silverado/Sierra fans. But, keep in mind HPTuners will not allow for full configuration like EFILive will. It is missing A/C pressure settings.