With the help of some guys over at pcmhacking.net I was able to get this figured out. If anyone else with a flex-fuel 12216125 os is looking to do the E-fan swap or wants the PCM to control...

Originally I was going to just use a diode and the A/C compressor relay trigger wire to activate the second fan but came across this thread...

Hello all. I'm fairly new with playing around with the ls platform stuff as I used to work in the import world. I have installed e-fans on my 2002 Suburban. So far the fans work based off the...

Thanks for the add. Just bought an old LS suburban I plan on playing around with. New tow vehicle for my daughter's race karts. Looking forward to seeing how much of my import tuning experience...