When things warm up enough, the aux cooling fan kicks in. A very loud rumble comes all over the place and feels like something is going to explode. I unplugged the aux fan and no more issues. This is the 2nd replacement of this fan. Tried used, then new. I'm thinking it may be the way the fan is mounted? The cage of the fan is all plastic. Maybe that's it? I'm thinking of just moving on to a all metal replacement aux cooling fan set up. Can't find any that has the same or greater area: cfm compatibility. Any help will put this misery out of my life and greatly appreciated.