So after a short while, the fan accelerated and the noise just stopped!!! It's working great!!!!
I used your guide with success as soon as I received your used fan by mail. Your guide was easy to follow and to execute. I did the replacement in about half-hour. The noise still persists, but the heating and the consequent turn-off stopped. Is there anything that I might do to stop the noise? Is it the screws too tight? too loose?