My two and a half ender 3 pro’s fan is making strange sounds. I am not sure what the fan is called but it is the fan that goes on when you select preheat. when the fan first starts it starts clicking, and at full speed it starts buzzing loudly. I tried blowing the dust out of it, but did not want to try and clean it out with rubbing alcohol or other substances for fear of damaging it. I don’t feel comfortable printing with it making a sound like that, has this happened to anyone else, and if so how can I fix it?