Mercedes W126 MY86 - 91 AC Control ACC Test & explanation how it works & issues with Temp Sensors

Please excuse the slightly cluttered and disorganized wiring in this video.
My primary objective was to conduct a preliminary test to see on if and how a test device could be designed to test these ACC’s easily.
So, I figured I share this preliminary evaluation on how to test those ACC’s with you and demonstrate on how the different outputs for aux pump, mono valve, blower control and the vacuum element switch actually behave in the different modes for cooling, AC and heat.

Please keep in mind when the yellow LED is on then there is NO HEAT and when yellow LED is off then there is HEAT