So I've had the car for about 3 years now. Just under a year after I bought it as the weather was getting colder it started making a whirring noise (a bit like the sound of reversing a car at speed if you know what I mean?). The noise doesn't happen when you first start the car up, but as it is warming up as you drive it, and stops a short while after the engine is up to temperature. The noise is worse in cold weather, and more accentuated as you go around a corner. It doesn't make it unless the car is moving, but stops making the noise when you put the car into neutral and coast along. It's only really audible up until about 40mph. I took it to the Honda dealer I bought it from as soon as it started making the noise. They couldn't hear anything. I took it in a further 2 times over a 3 month period, even leaving it with an engineer to drive every day for a week. Each time it came back as there is nothing wrong with it! It stopped making the noise in the warmer weather. Next winter it started again. The noise was no worse for a year of driving it. I asked an independent garage to listen out for the noise whilst it was in for a service. They could hear the noise, but couldn't diagnose. The cold weather is coming in again, and the noise is going to start irritating me again! Any ideas what it could be, and if it could be a simple fix, or something more serious? I have a 2.2 CDTI. I've searched on the web many times watched a lot of Youtube videos, but alas none are the same problem as mine!