I searched. I got a set of efans and a stock harness. Can I use run my efans for now, without using the pcm? (Not ready to tune it) could I get a temp sensor to turn them on and off, and just tap the a/c power? I've seen the sensors that stick in the fins in the radiator? Or am I just being dumb.

 

I have mine ran by two switches in the cab.

 

Compressor Works/Cooling Fan Control (733652) | 2003 Chevrolet Silverado 2500HD 4WD 8 Cylinders G 8.1L SFI | AutoZone.com

Compressor Works/Cooling Fan Control (733647) | 2003 Chevrolet Silverado 2500HD 4WD 8 Cylinders G 8.1L SFI | AutoZone.com

either should work

 

I have my ran on my 91 silverado when ing. On fan come on..but you have to have a on-line fuse tho