P59 AC request - I've read so much but I'm stuck

[ERALEEK]

Good afternoon, I've probably read more about A/C requests and P59's in the last month than is healthy. I've learned a lot.
That said, I'm also apparently pretty dumb. 1981 C10 shorty swapped with an LM7 5.3 4l60. Ebay harness with the bare minimum in place.
Texas is already hot and I'm months behind where I should be.

Before I license and spend on the set up/PCM I currently have, I wanted to throw it to y'all for two reasons:
1. I'm confused.
2. I'm worried I'm missing internal PCM hardware and am not smart enough to figure this out on my own. Would it make sense to ebay a PCM that already had fan/AC parameters I need or do you think flashing this one with a new OS will do?

The truck runs and drives (not for long just got devastating trans codes and bad shifts) but I'd like to get the AC in while I have it dead in the garage.

There are some tremendously innovative people in here and most of my questions have been answered by rocketmans LS1 thread and lt1swap, however, as I mentioned above, I must be pretty dense.

Here is my 2004 Yukon PCM (OS: 12585950) (I know I have to use serial data request and am intending to go that way, unless y'all see an easier way). I've attached my .hpt to this thread.

MY SETUP .png

I'll see screen grabs of other people's fan set up options that have so many more ac fan related parameters (like the pic below)

OTHERS SETUPS .png

My question is - if/when I license this PCM will more options come available? Sorry if this is basic, I got hptuners a month ago and have been watching tutorials and reading as much as I can from here and lt1swap and a couple other forums.

I just got back from a junkyard and got a 2004 GMC Envoy HVAC Module - (it has A12 and B11 to the PCM) once I feed it 12+v I intend to run those to the PCM based on the below schematic from lt1swap:

03+ GM Truck AC wiring.png

The Yukon OS I currently have did not have electric fans but I have them in now and can control them with the scanner. However, all of the missing options make me queasy. I get this is incredibly basic for most of yall but I'm still learning. I'd appreciate any help you can offer.

I am putting in new Spal fans later today to replace the ebay fans that came with the radiator I bought, they are severally underpowered. I have a new evaporator, new condenser will be here in a couple days. Also picked up a 3-pin pressure transducer pig tail and have ordered the pressure transducer (1551343 AC Pressure Sensor Switch) from amazon. Before I make the lines I'd like to resolve this.

My end game is to have the PCM control the AC with fans/idle bump/WOT cutoff etc.

Also, If you're in DFW/Texas - I'll certainly pay for the help. It appears the vast majority of users have figured this out - wiring is not my strong suit. Thanks in advance and I hope the pics/attachments work or get linked.

[verlon]

Serial AC Request will work on any P59 PCM, it is a matter of correct calibration, but IMHO HVAC as a standalone module is not a reliable thing. I'd go with a discrete AC Request.

Tahoe/Yukon P59 PCMs has no discrete AC Request populated. You need Express PCM. They has different service numbers.
Or just solder two resistors and one capacitor on the pcb, sorry have no photos, done it years ago.