A noisy or broken cooling fan is inefficient and might not bring enough air into the case to keep your laptop's components cool. Often the problem is simply dust, dirt or other debris clogging things up, which means a good cleaning will solve the problem. If, however, the fan blade doesn't spin freely or makes noise after you've cleaned it, it needs to be replaced.
Shown here: Blowing dust out of the slotted grilles on the side or bottom of the system with a can of compressed air, opening the case, blowing away additional dust and detritus inside, removing the old fan, preparing the new fan to be inserted in the laptop.
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