Well guys, I have a functional HVAC system now. The only problem is that I have no idea what I did to fix it.
Per the provided advice, I went to swap the controllers between my two cars to try to narrow down my problem. After about an hour of fighting to get one of the controllers out, it was getting dark so I started to give up for the night. For giggles, I plugged in the main connector and keyed up the car and like magic it worked. I've had heat for two days now and it acts like nothing was ever wrong. '
While the advice didn't prescribe the actual fix, it at least motivated me to tear in a little deeper and get it up and running on accident.
Could it be that there is a memory in the controller that simply needed to be powered down and reset? My intellectual side isn't satisfied just knowing that it works, it wants to know WHY as well.
Thanks again and if you have an explanation as to the why, I'm all ears (or in this case, all eyes). '