Thanks Ken. I already have a new control panel on the way. I was waiting to take the dash apart until that panel arrived. I'd rather only do it once. Lol. In the meantime, I have the 6 volume set of GM service manuals for this van. There is a ton of information there. I'm poring over the Wiring Systems and Power Management section now. With your help I at least have an initial path to follow. Once the panel arrives, I'll be pulling the dash and the engine cover off to check the ground connections on the back of the left cylinder head and any wiring harnesses related to the a/c controller.
I'll definitely let you know what I find, and I'll record any anomalies I discover.
Thanks again for all your help!
Sunday, June 4th, 2023 AT 12:31 PM