Originally Posted by
2K_Silverado
Thanks for the help, 2x.
I'm told the harness is for 1999 - 2007 trucks. It's three relays with one wire going to ECM pin 42 and another going to the green wire for the A/C. I have a 2-core aluminum radiator, so I don't think cooling is going to be an issue. I just want the fans to turn on and off when they're supposed to.
So it seems to me that I have two options. The first is to update my current OS to the newer version with whatever steps are necessary to do that and then flash with my current tune. That should cost me one credit, no? I don't know how to go about updating the OS, so if you know, please tell me.
The second option is to get an 0411 ECM from a 2002 Silverado (easily done) and flash it with my tune. That should cost me one credit as well, no? I don't think I need to care about VIN mismatch since we don't have smog checks here, but it would still be good for it to match the truck. I'm kinda fussy that way.
If it's not that simple, please tell me what I'm missing and how to go about getting this issue resolved.
I appreciate your help.