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I just picked up my 2019 M40i two days ago. I knew ahead of time that ordering the ventilated seats meant I would not be able to get the adjustable side bolstering, but I opted for the ventilated seats. I regret it.
First, the ventilation does not seem to actually do anything. Even on a relatively cool night I felt my back getting sweaty, so I turned on the seat ventilation to max.
The first thing I noticed is that the seat ventilation makes a loud noise that seems to emanate from near the back of the top of the seat, so it is near my ears.
The second thing I noticed is the ventilation didn't really seem to do anything, even after running for 15 minutes.
Overall, I feel like I gave up adjustable side bolsters for a noisy fan that doesn't seem to do much. Maybe it will be more effective on a really hot day.
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