This can be because of two reasons.
First : Dust is settled in your fan surrounding and the air in/outlets. Cleaning the dust can reduce the noise upto a great extent.
Second : The processor got older and now the fan has to over work to take away the heat, this happens with the aging of the laptop. Some processes and programs may overload your system, so it can also may be a cause.
Try a complete virus scan. Clean the air outlets near the fan. Here are the ways to clean the outlets.
The first easy attempt: Blow hard into the cooling fan air inlets and
outlets. Chances are good that the fan noise decreases immediately.
Second more serious attempt: Open up your laptop (be careful!) by for
instance, depending of model, removing the keyboard usually by removing a
couple of screws on the back of the laptop and maybe some locking
straps on the front. Then remove all dust you can see by for instance
blowing hard on and around the cooling parts mentioned above. Note:
Saliva and laptop electronics is not a good combination so be distinct
but careful. Good luck!
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