My fans are making a lot of noise, the are brushles fans and they sound like a rocket ship taking off inside my computer. Ist there something i can do to the fan like spray a lubricant or something.
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Did they always make noise if so then that is the style of the fan and short of some type of muffler you cannot stop the noise. If the noise just started then you can remove the hub cap, sometimes held in place by a C clip and drop some machine oil in it. WD40 is risky since it is flammable and a small electrical spark could start a fire! This is not probable though only possible.
Another thing worth a try is to open the case and make sure no cables are touching the fan itself. If they are you can pull them closer together and hold them with a tie wrap or something similair.
Most lubricants use some kind of petrolium distillate, which can break down the plastic in a cooling fan. You could go out and buy a new one, but this is much like buying a new VCR every time the heads get dirty. Hey, they're cheap, just buy a new one and throw the old one away! However, if you just peel back the adhesive sticker (or remover the rubber cap) you can extend the life of your fan by as much as tenfold by applying a drop of glycerin (USP)to the bearings. A bottle of glycerin is a lot cheaper than a cooling fan and will last a lifetime of repairs.
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Noisy Fan