From the looks of the diagnostic values they appear to be before the engine was at operating temp. From my recent experince with low freon I noticed that with the engine at operating temperature and the AC running for at least 15 minutes, the left heater core temp (3) will be higher then the right heater core temp (4). You will also notice a greater difference between the inside car temp (1) and the outside temp (2).

Since the W210 uses a variable compressor, you will need to monitor the refrigerent pressure (5) instead of looking at a snap-shot. Now that my W210 blows cold air on both sides, I noticed that the refrigerent pressure runs around 15 bar.

When I ran the flapper valve test, I noticed that there was about a 5 second delay for the valves to reposition.

I also think that your car is low on freon.

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Ray
1998 Mercedes E320, 200K Miles
2001 Acura 3.2TL, 178K Miles
1992 Chevy Astro, 205K Miles