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Heat Sensor Faulty

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My laptop have been facing heat issue for the past couple of months. It already lasted me 3 years plus. Recently my laptop instant power down due to CPU heat reaching 105 degree Celsius. I tear the laptop apart since there is no more warranty, I notice it is using two PWM fans. I manually cut off the wire which control the fan speed for both fan so that both fan will run at its maximum speed. This produce a very loud and annoying noise. The main question is, when the fan is function at PWM mode and give that the CPU already reaches 100 degree Celsius, the fans should be running at maximum speed(same speed when I cut off the signal wire) but it is running at a lower speed(Based on the sound produce by the fans).

EDIT: I have also apply AS5 for both the GPU and CPU.
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The BIOS controls fan speed. That means it can potentially cap the fan RPM and cause the CPU to overheat if the fan curve is setup improperly by the manufacturer (optimizing for quiet fan noise at the expense of cooling performance).

At any rate, here is my advice:
1. clean heat sink using compressed air. dust acts as an insulator causing electronics to overheat faster.
2. reapply thermal paste. be sure to thoroughly clean off the old thermal paste with a lint free cloth and 99% isopropyl alcohol. apply at most a rice grain-sized amount of thermal paste. AS5 will also take time to 'cure'.
3. run you laptop in an air-conditioned area (preferably <26 C). this might be a challenge in Singapore.
4. undervolt your CPU
5. get a laptop cooler
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