I have a 99 silverado with an 02 pcm, and a set of ls1 e-fans. I have been told I can, and can't control them through the pcm. So, my question is can I wire an efan harness to pins 33/42, and control them with the pcm, and hptuners.

 

yes you can. wheatley set it up for me just a few weeks ago.

 

Yes, low speed is controlled by the temp you set it at, high speed is controlled by A/C pressures. What I do not know though is how A/C pressures correlate with temperature? A/C pressure goes up even with the A/C off?

 

I thought so, I want to get all this little stuff squared away before the turbo kit gets here. Does someone make a harness for ls1 fans, and pcm pins on it?

 

Blackbear sells the harnesses i assume you can get the different ends put on when you order.

 

I was looking in my basement and found 3 pcm pins, so I should be good. Thanks guys.

 

the harness comes with the pins on it!

 

^ What he said ^
I went the Blackbear route also, but have '05 e-fans. BB can set u up. Side note, what are odds of 2 Brent's replying to each other's posts? They even joined at same time, w/. screennames thatare similiar other than last 4. Just found interesting, nothing further.

But ya, HPT can do dual fans.

 

I knew I liked that guy for some reason.

 

The AC fan control via AC pressures is basically to turn the fans on high to cool the condenser to keep the AC working properly and blowing cold, it has no correlation to temperature