A CPU cooling fan is a dedicated fan which cools down the heatsink and eventually the CPU (Processor). Usually the CPU cooling fan comes as a part of the heatsink assembly – a metal part drawing heat from the CPU chip. In addition to the CPU cooling fan, some laptops have a dedicated GPU (graphics processing unit) fan which cools down the GPU chip.
This guide explains how to apply new thermal grease on a laptop processor (CPU).
Thermal grease (aka thermal compound or paste) has to be applied on the top of the processor before you install the heat sink. Thermal grease helps to conduct heat more efficiently.
In some laptops you can remove the heat sink without removing the CPU fan. In my case, I had to remove the fan first.
Does your laptop shut down in the middle of doing something without any reason and warning? Does your laptop run much hotter then before, the keyboard and the bottom part of the laptop feels very hot? If yes, your laptop overheats and has to be cleaned. It happens because the heat sink is clogged with dust and lint preventing normal air circulation.
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