I have Had my cooler for about a year now and I too have noticed a high pitch whine coming from the fan. I have cleaned the dust out in hopes that it was just a accumulation of dust. I have not yet tried tightening the screws that hold it to the bracket yet but will.
In the mean time. I am searching for a good fan replacement. and while searching for alternative fan options. I also came across several people, and even a review that indicated that the fan was glued to the plastic top Piece and that it is very difficult to remove without possibly breaking it .
The review made it sound as though this gluing of the fan to the plastic top piece was Intentional. But another person that had attempted a fan replacement. Indicated that although his was also Glued on . He felt that it was not Intentional. and It appeared that during the Manufacture process there are two foam pads that were applied with two strips of glue and thinks that the glue was still wet when the top was clipped into place at the factory which resulted in it being glued to the fan.
My question is. If in fact mine is glued, and during the process of removing it I break the plastic top pieces. Does Coolermaster sell Individual replacement parts for this Cooler.
I would hate to attempt this and end up with a cooler that is broke. I would feel more comfortable doing this If I new I had replacement parts available