Will the 0411 control Fans when A/C is Switched ON???

[BlazinDorito]

I have a 1996 GMC K1500 Sierra with a 454 and using the 0411 ECM off a 2002 Express Van along with the 2005 Silverado Dual Electric Fans with the original fuse and relay harness.

But when I turn on the A/C the fans dont come on. does anyone know how to or if the ECM will control them??

[BlazinDorito]

I guess nobody knows!!!!

[ScarabEpic22]

I know in EFILive there is a parameter in the fans section that controls whether the fan #2 output is for fan 2 or A/C Recirc. I imagine HPT does as well, does the second fan come on with the A/C?

[BlazinDorito]

Thanks for the help. But I think I just need to add the a/c refrigerant pressure sensor to activate the fans. I looked up the wiring on trucks with electric fans and requires the sensor to let ECM know the pressure on the system. I'll find out tomorrow after I install the sensor and let you know.
Thanks

[Leafy]

Maybe post in a v8 section? Most of us here have half the cylinders as you and a quarter of the displacement.