Does the A/C compressor engage? Just trying to get all the facts straight.
What was the last thing you repaired on the car, no matter how remote it seems from the A/C.
I'm not hip to the W124's so I can't really help you with the vacuum diagrams but there are plenty of people on this board who do know.
Shucks, you don't need A/C yet anyway. It ain't got hot, yet!

"Can't be but 114 in the shade".