Hello, I have a curious phenomenon with my V70 III 2.5FT BJ2010, which occurs only in winter (temperatures around the freezing point). If you have the ventilation on “car” and drive for a while, then at some point a relatively high frequency noise appears, slightly pulsating and reminiscent of a cricket / chirping bird in the interior. Something difficult to describe. It is not super loud, but well perceptible by the driver and passenger. It may be that the noise after 5min, sometimes n Ach 10min comes, but with a longer ride at these temperatures it comes safely. It then behaves periodically, i.e. after a few minutes of noise it disappears again for several minutes and comes back again. Unfortunately not really regularly. I can create remedy by manually controlling the ventilation motor, from a certain speed it stops. This can be higher but also lower than the “car speed”. What I have already tried – climate on or off makes no difference -eing The temperature generated makes no difference -to manually put airflow up, center or bottom makes no difference Could still test the convection valve, so to manually or to set it to whether this will affect you. I mean, the noise also changes when you drive on gravel runway or slope/fall (that would speak more for the fan motor). What I find curious, however, why does this only occur in winter? Does the hub of the fan motor/is no longer correctly used? In the summer it has disappeared to 100%, no matter how you adjust the automatic air conditioning system. Unfortunately, there are different actuators in the whole ventilation, which might also be in question. Would you like to have precisely diagnosed the cause, before I start to expand everything. Did someone have/had a similar noise only in the winter, which had changed/disappeared with turning at the fan speed? Thanks VG