on 2012 Silverado 2500 with an E78 ecm.fo some reason I can not for the life of me get the fans to turn on. The first question will be are they wired up correctly? To the best of my ability.. on my VCM scanner i can trigger them on and off and in my tune if I add a "l" to output vs state always on when the key is on they turn on but not with ECT.
That being said,dose the a.c. pressure sensor pay a roll in the e fan activation i.dont have that hooked up
And 2..is there a special software that the ecm would have to be flashed with at the factory in order to run fans. This truck came stock with mechanical fan so I used the wiring schematics off a chevy cruze since they use the same ecm. Any help would be appreciate as the vehicle is running and driving "swap" now,I would like to keep it cool and not revert back to the mechanical fan.