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Heat sink Problem with inspiron 5520 15R

hello , as the title suggests there is a problem with my heat sink it works normally when u start the laptop 
most of dell laptops once starting u would hear the heat sink so im sure its working because it does that the problem is when the windows starts up it doesn't operate its at a complete stop i cleaned i cleaned the vents so im sure its not that but what i have in my mind is the processor paste might be the problem so im wondering if that can cause the heat sink to fully stop operating because the temperature isn't delivered to the temperature sensor ?
im an engineer i know how to tear my laptop apart in case i need to apply that paste just want to make sure before i open it 
thanks in advance 🙂 

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