My poor Mini Cooper D (07) is crying!
When the car reaches 70mph a small ‘screeching’ sound can be heard coming from somewhere near the top of the dashboard – I think it is coming from the air-venting system. At 70mph this is only a small noise (not really enough to be able to diagnose the problem) and then it stops until the car reaches 83mph at which point the noise turns into a loud constant screeching and gets louder the faster the car goes. At 90mph the noise is very loud. The noise only occurs under certain driving conditions – the car has to be on an open piece of road (ie, no tree screening or banking to the sides of the road), it has to be reasonably windy and I think the wind has to be hitting the car on the left hand side for the noise to happen. The windier the conditions, the louder the noise gets. I am sure that it is some problem with the air-venting system. The screeching is sometimes so bad that I can’t even hear the radio over it! It is extremely stressful on a long journey.
The trouble is the dealership won't drive it over 70mph and I have tried to demo the noise to them, but of course it wouldn't do it when I wanted it to! They have had a look for anything obvious, but couldn't find anything.
Has anyone had anything similar?