Has anyone installed factory E fans, factory E fan harness, and programed PCM to control them like a 05 up 1/2 ton does. After saying this in my IMO
I would like the E fans to both come on at low speed with A/C high pressure over 200-225 pounds, high speed fans if pressure goes over 300-325 pounds,
and high speed if engine temp. goes over set engine temp. somewhere around 210 degrees. I think with enough time I could figure this out, but if someone here has done this it would make me feel better. Thanks for any input/expertise you have on this.

 

I did something similar but not with Factory stuff, but it uses the same logic (AC pressure and ECT) that had.... You have to have EFI Live inorder to program it like that, HP Tuners does not have the capability to program AC pressures.......

IMO you will want the High side to come on earlier than what you have listed, the air will be alot colder, at least that was my experience here in +100* heat....

Here is how mine are setup....

 

Also does the factory harness use relays already in the truck, or do you need to add them. The factory harness I got does not have any relays the part # is 10385842 is
this correct? It appears to be the front complete body harness. Seems like I need
more stuff?

 

I made my own harness to work exactly like the factory harness and it was a lot cheaper....

 

Thanks for your input. I know I am a little weird as I use my block heater on my gasser under 30 degrees. For me my mods are done as close to factory as possible with my little tweaks. Money wise I don't mind spending a little more and spending a little more time to make my mods look as factory as possible. I take pride when I open my hood and a Chevy tech that has worked more than 10 years on these trucks can not tell I was there.