Had some modules to do some testing. CCM, LKM, GM5 and IHKA modules. 4 of each, no joke.

Swapped them all 1 by 1 and tested, nothing improved. My defroster, A/C, recirc and auc are still not working and the blower only gives hot air.

I have one more swap to make and that's the control panel itself. In addition I am going to check some ground points to make sure I don't have a grounding issue.