If you want the pcm to turn the fans on, you'll have to have the pcm adjusted. The truck pcm has the fans set to like 270deg.,

I think this is the best way to have the fans turn on , and i really regret waiting so long to hook it up this way. It's nice not to have to worry about them coming on.

If you're interested, send me your pcm and i'll set them to whatever you want for $35. That's about what a relay setup for a thermostat from painless will cost.
btw, you'll gain a few more hp's with the electric setup.

later,

allen