1) It is true for the 300D W123 chassis. The pod has 2 inlets like your diagram. W126, W201 or W124 chassis use push and pull, i.e. it pulls vacuum to lock or pressurize to unlock. The pod only has 1 inlet.

2) True but the pressure would never be greater than atmospheric pressure, i.e. 14.7psi.

This is my understanding.

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Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed.

W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html

1 X 2006 CDI
1 x 87 300SDL
1 x 87 300D
1 x 87 300TDT wagon
1 x 83 300D
1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry.