With my model 190D, with my climate control unit, it has a "Dehumidify" button on the far top right. Its above the A/C button.
My question is for some reason I have much more cold air and compressor on time with the Dehumidify button over just using the A/C button.
To make matters more odd, the car manual states that either button can be used for cooling.
I really is such a strange system!

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87 300SDL
87 190D 2.5NA 5sp
90 300GD with 606 turbo!
08 GL320 CDI
12 ML350 Bluetec
---------------------------------
Past rides:
82 300SD - the one that started it all!
81 240D
87 300SDL - the first one.
92 300D 2.5 Turbo
99 E300 Turbodiesel
07 E320 Bluetec
12 S350 Bluetec

When you select dehumidify, the compressor runs on every setting, including heat. I use it on misty days to keep the windows from fogging.

Why would it work 10 times better with that setting instead of just the A/C button?? ( In my case )

__________________
---------------------------------
87 300SDL
87 190D 2.5NA 5sp
90 300GD with 606 turbo!
08 GL320 CDI
12 ML350 Bluetec
---------------------------------
Past rides:
82 300SD - the one that started it all!
81 240D
87 300SDL - the first one.
92 300D 2.5 Turbo
99 E300 Turbodiesel
07 E320 Bluetec
12 S350 Bluetec