E220 W212 weak centre air vents

[L80OUS]

Hi all, I've noticed the air/fan doesn't blow out my centre vents as much as it does the side vents, I would say less than half the speed. It does increase slightly with the fan speed going up or down. Is this a normal thing is has something stopped working?

Thanks

 

[TeddyRuxpin]

I believe it's normal. They will also never blow out hot air on the 'auto' setting, unless you put it on 'middle vent' setting and a warm temp. I think this is just how MB has decided it should be...