Hey guys! So I'm getting my truck tuned again for electric fans, I ordered a harness from PCM of NC, and followed there instructions, put the pin in 42 blue, and removed wire from pin 33 red and added theres. My one issue is that I was looking up the wire diaragram for the wire to splice into my fuse bock c2 b3, and it says to use this wire for the ac fan to trigger, but yet the relay isn't names anything for the ac. Another person added there DIY thread online which is pretty popular thread
I installed 2006 E-fans on my 2001 | Chevy Truck Forum | GMC Truck Forum - GmFullsize.com

And copied his since it's an 01 aswell and spliced into that green wire. Wel my question is without getting a tune, is there a way to test to see if my fans will work and I wires it up correctly?

 

If you ground the "control wires" the fans should come on. Depending how its wired, when you ground one they will both come on low (or one on high), and when you ground both they both should be on high.

 

I found out how to test it. The PCm of NC instructions told me to remove pin red 33 of the pick and wire it into c2 b3 which is the green wire in the other gentlemans threads. I can turn on my ac and both fans are on and on low setting. I drove home today with my ac on when it's already 95 today, ac was colder than ever, and truck ran better and didn't feel like it was trying to spin a fan. Never overheated yet, going to get it tuned tomorrow so should be fine!