For the past couple of days I've been getting this weird whining noise coming from the car - particularly when driving slowly. It sounds like it's coming from the passenger side of the engine bay. It generally happens when I'm moving - and I don't think it's the brakes - cos it happens even when I'm not braking. Also, doesn't seem to be related to steering. It's like a whistling noise - constant, but not as high pitched. It happens even when the car is cold.
Anyone have any idea what it could be?