OK, gauges have been ordered and are en route.

I put the AC on with the car in the garage and shot this video. It is difficult to shoot in there! https://www.youtube.com/watch?v=2ui7-KtopyE

I couldn't quite tell if the outer was turning. There was definitely an a portion of the bore I could tell wasn't turning.

I left it on for about 5 minutes, which never engaged the secondary electric fan. Also after 5 minutes, I felt both of the lines, but neither of them was appreciably colder. Is the suction the line that goes from the low side fill port to the compressor?

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W201 1989 190D