I have a 2017 C Class with twin vents at the rear. These don't seem to do anything - they don't blow any air. When I turn the knob, they seem to open and close, but still no air. I'm wondering... are these just decorative?
Look in your user manual, some cars have a switch to enable/disable the rear vents and some cars have sensors in the back seat cushion to detect if there are any rear passengers, like with the rear seat belts.
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