I was driving down to Chester yesterday and i have started to notice a really annoying problem with my air vents when i was driving with them on setting 2 blowing onto the windows i noticed they were making a huge amount of noise, so i turned them down to setting 1 and the problem was still happening but to a lesser degree. I then turned them down to 0 hoping that the air con would stop blowing. It didnt, it seemed that even though i had the air con off and vents set to 0 i was still getting the air coming through the vents because of the speed i was going at, call it 70mph. it happens at 30mph but to a much less annoying level. Is the only way to fix this to twist the air vents to completely shut them off, or should setting the blower speed to 0 do this anyway.