I show you how to fix the problem I had on my BMW E65 E66, out of nowhere the engine fan turned on super loud full blast like my engine was overheating, this would happen if when the engine was cold. There was no overheat warning on my dashboard, I already fixed my thermostat and it was still loud, and my BMW E65 E66 water pump still looked good. So I changed the lower coolant hose sensor and the water pump sensor and now my engine fan is quiet again. Thank you for watching.

God Bless