I’ve been driving my G for 4 months and I’m only getting to know the “fan” in this really hot weather. At a cooling water temperature of about 100°C it starts when you give gas. It sounds like a loud noise, like a turbine with its wind noises. The engine noise comes into the background. It’s not unpleasant, but loud. You only hear the wind noises, not the fan motor or the like! Is that normal?? If enough wind is recorded, the noise disappears. I hope there are some G270 CDI drivers who can tell me about their vehicle!