Ventilated Seats
Ventilated Seats:
The fan is running, but I feel nothing coming out of the ventilated seats, all the lights are blue, you can choose up or down the setting but no air flow coming out?
This is happening to both seats. Last two weeks you could feel the cool air flow.
All the seat movements and adjustments are working. Any ideas?

I read a lot of threads and it appears that there's some type of debate if cool air actually comes out or not.
It's interesting, but I test drove a new Ford F-150 for a few days. It also had this feature although it was advertised as being "A/C" instead of "ventilated." The effect was much more pronounced in the F-150 than the Mercedes models I own with it (W211 E320 CDI and W221 S600). It felt like there was cool air being piped through the air conditioning and through to the seats.
I have never been able to really feel much just touching the seat but I can feel it sitting on it. I would say there is a very good chance the car is functioning normally.
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On the other hand on my Lexus IS350 when the fan is set to high it can actually be quite startling to the uninitiated. Quite fun though on unsuspecting passengers…

I also find the heat weak on the S whereas on my '08 E320 the seats would cook your butt like a flame broiled Whopper if you weren't careful. You would get out of the car with grill marks on your pants.
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