Here was the solution to my HP x360 fan noise issue. Everyone is talking about the fan speeds, but the fan should be virtually silent during use. You shouldn't even know that it's on at low speed. Follow me here... You laptop chassis has flex. It's built to have a certain amount of flex. It's designed into the unit. The fan is inside of an enclosure. Sure, it might be dirty... but, more than likely, the metal plates and case of the fan enclosure is slightly bent, causing the fan blades to contact the enclosure. First, clean it out thoroughly. Take the fan enclosure apart. Careful not to lose the little screws. Take the fan blades out and clean them...REALLY clean them, with a clean, dry toothbrush, or something of the sort. Clean out ALL AREAS around the fan location. We're cleaning for two reasons. To make sure that no dirt or dust get into the fan, AND to make sure that no buildup is pushing against the fan enclosure in any way. Put the flat enclosure pieces on a flat glass table, and look to see if it's...