For folks still chasing this. If you have a 95 and need an AC board. You have a couple of options. You can still buy ACDelco 15-72266, which LOOKS like the 96 board ACDelco 15-72547. Has a harness and a defogger circuit. I did, from Rock Auto 1/6/2020.
ACDelco 15-72266 (AC, RD, 95 Harness, ACDelco 15-72266, (Aftermarket) Dorman 599-006 - All appear to be the same part, 15-72266 includes the harness.)
ACDelco 15-72267 (AC, 95 Harness), ACDelco 15-72548, (Aftermarket) Dorman 599-007 - All appear to be the same part, 15-72267 includes the no defogger with AC harness for 95.)
It appears that ACDelco 15-72267 (AC, 95 Harness) is no longer made. This harness or part is the holy grail.
It appears no one has a "copy" of what the harness should look like or how its mapped.
This link below breaks down the blower connection and the AC connection. This is the only article I could find with a breakdown of what needs to happen.
https://www.silveradosierra.com/how...k-series-trucks-hvac-control-unit-t77522.html
I am going to validate that unplugging the defogger connection to that board does not impact it working. If it does you could buy the 15-72266 one time for the harness and when the board fails again, just replace the controller portion with your favorite number and use your very expensive harness.
It appears that with the correct connectors scavenged from a 96+ truck you could build your own harness.
I am going to map out my harness for folks with defogger. Then I will try and map out what a harness would look like and build one without the defogger (which is what i really want) to see if I can make it easier for folks to buy one of the available part numbers and plug in your harness.
My truck does not have the the RPO code C49 which is the defogger. It has the C60 for AC. That thew me as it looks like my truck has the front part of that defogger circuit (30AMP breaker under hood, all pins in the two dash connectors etc) but no wiring to the rear window that I could find. There was a picked part in the truck from an original 95 something with defogger when I purchased it. So I chased my tail a little bit until I understood the RPO codes.
I am hoping that just unplugging the defogger and basically eliminating those wires the harness is the only thing required for AC no defog. Because the harness is in my possession, I can easily map it and post the results. Then it will be easy to create a build instruction for folks to create their own harness. (It seemed to be fine to have them plugged into my truck before it failed. I replaced the radio and bet I shook loose whatever was holding that board together.)
Hope this helps. I will update any error and change the date so it might be easier to reference.
Thank you.
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1/13/2020
Harness Trace for AC Delco 15-72266
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