My wiring harness came with two fan wires labeled "Fan 1" and "Fan 2", and within HPT I see that I can control two fan's on/off temp, how long they stay on after turning the truck off, ect. I'm only running a single Lincoln Mark VIII 18" fan for my radiator that could probably take my truck into flight if I ran her at full speed. lol What I had planned on doing is just tuning "Fan 1" to trigger a relay which then provides power to the electric fan, it's either at full speed or off...I can't think of any way to get 2 speeds out of her but I'm not too worried. With my setup I doubt my fan will ever be on as long as I'm moving forward with sufficient airflow because of how overkill the radiator is (summit dual core all aluminum radiator meant to upgrade a stock 1500HD 6.0L's radiator). The fan is there really for sitting in traffic on a hot day in the summer, or when I'm really romping on it off-road. Any time the fan turns on it will pull +/-5500 cfm through my monster radiator so I think I'm good.

Any ways, back to air conditioning. That's where "Fan 2" pig tail comes in, which is load rated for 33amps which should be PLENTY to run without a relay powering a small 8" electric fan to pull air through my remote air conditioning condenser. I have not installed the A/C compressor yet, as I want to get the motor running and tuned first before I hook up any A/C. My stock 4.3L condenser is probably in some garbage dump outside of the Twin Cities right now, since I tossed it to use the stock A/C condenser off a 2006 Dodge Ram 1500 V8 with a shrouded 8" electric fan, all-in-one "kit" if you will, that I bought off eBay. It really is a nice setup coming from MOPAR , which makes my life a lot easier as a remote A/C condenser rather than trying to stuff my dual core radiator into the core support along with my stock A/C condenser.

I am wondering if HPT has the ability to sense whenever the A/C request wire is hot, and at the same time activate "Fan 2" which will always be on anytime the A/C is, pulling air through my remote condenser. I figure there has to be a way since the PCM automatically bumps rpm's up a little when the A/C is turned on so I know it recognizes A/C on vs off. If there is absolutely no way to tune this "Fan 2" wire to do what I want, I have a backup plan which will piggy back off the A/C compressor's request wire and trigger a relay, which in turn activates the fan. That might be easier in the end, but it's one more thing I'll have to wire so I'm trying to take care of the A/C issue with a few clicks, rather than a few burnt fingers since I suck with a soldering iron.