Antwort auf „How can I replace my CPU fan?”That's because your fanwheel blades have too much dust and fluff built up on it. Just take it out and and clean the fan blades from dust with a soft brush. If you brake the assembly, willingly or accidentaly, you can put it back together with a good quality sticky tape. After this a bit of vacuuming does help from the outside once a week or so to slow this dust accumulation. It worked for me and had to do it about 3 years after I bought it.