Thats how ive wired up a few trucks.... No problems...


Coolant temps get up to 200 both fans come on low speed and go off when coolant gets to 198
When the fans are on low speed and the A/C is turned on ... both fans come on high..

Temp is below 200 and A/C is on then just Fan 2 comes on high speed.

If Temp is above 210 at engine shut down the fans stay on low for 5 minutes.

No lights diming and havent had a cooling issue this summer..

Put the same fans on my buddies Z71 and wired it up the same as mine.... No complaints either..

 

I'm not even running the wire for the a/c at the moment, I have the fans on low 24-7 . . . I moved and I'm spending more time sitting in Houston traffic, and they're still working great

 

Yea ive never had a problem with it ever gettin over 200* with them on low....

 

So can you or cant you control 2 fans with an 02 pcm?

 

To TooTall: tyvm for the link..got my fans in and running....both on low after start up and when AC on both on high....boy do they suck air...now just have to have someone tune my parameters....thanks again

 

I recently installed twin fans on my 98 Suburban.
They're wired the same as the above drawing.
I have an 0411 PCM and use pins 42 and 33.
Two fans on low at 93oC and off at 91oC
Two fans on high at 104oC and off at 101oC.
I also use EFILive.
If you look at the fans parrameters in an 05-07 truck, it uses A/C auto recirc as 'fan #2 control'.