Was just thinking after reading Joe H's comment.......my manual control setup, came with 2 valves that were to be placed in the heater circuit hoses. One was cable-controlled that regulated the volume of flow of hot water through the heater core. The second valve was a simple shut-off valve that completely shut down circulation of heated water in the inlet hose when you screwed down the valve manually.
If you plumbed in the heater circuit you should have some type of shut-off valve in your electronically controlled setup. If by chance you didn't plumb in the heater circuit, you can ignore this info.
As for the "free-wheeling" comment......it was in reference to the first part of your video where the engine was running but the clutch on the compressor wasn't engaged. As the video progressed you kicked in the switch and the clutch engaged and the compreesor did it's thing. This would tend to eliminate the premise that the system was low on a charge and confirm that the low-pressure switch was functioning as normal.
Dave
