A/c control panel When it fails, I get no fan, or temperature Change?

The pin looks okay, this kind of problem happens when the system is overloaded due to a bad ground or high amperage output. I would use this guide to help check the grounds and if okay I would replace the blower motor and resistor:

https://www.2carpros.com/articles/how-to-check-wiring

Here are the wiring diagrams for the HVAC system so you can see which wires to test and how the system works. Check out the images (below). Let us know what happens and please upload pictures or videos of the problem so we can see what's going on.

Thank You Ken! I will definitely look into that. BTW The pic in my first post was NOT of the unit I pulled out. That was just a stock photo I used. The two attached to this response are from my van. Hope they clear things up.

Yep, that terminal is overheated, can you tell me the color of the wire in the connector that the terminal corresponds with? Also the wiring connector will need to be replaced along with the HVAC controller.

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!

Upon looking through the service manual I came across this page which seems to be the connector in question. If so the wire color would be BN (brown). If I’m interpreting the chart correctly, the function of that wire would be “Run ignition 3 Voltage”.

Yes, this should be 12 volts with the ignition on, engine running, please check the wiring diagram I provided to confirm.

Well, this looks less than desirable. Now to find out why.

It could have been a bad connection from the start, bad ground or the blower motor is pulling too many amps. Thanks for the images and let me know what you find.

Will do Ken! Thanks again!

Please let us know what happens.

Okay, so today I spliced in a new wire and connector. I used the original plug. It wasn't so distorted that it warranted cutting and replacing all the wires in that plug. I also checked the ground wires behind the pass. kick panel and on the rear of the left cylinder head. Both were tight and clean. I reassembled the dash, and the A/C is blowing cold as it should.

Thanks, Guys for the excellent assistance!

Nice work on the repair! Glad you could get it fixed, thanks for letting us know. Please use 2CarPros anytime we are here to help.