SauravPadghan said:

I got a Nitro 5 with the i5 9th gen processor and GTX 1650 graphics, it had been working well for around 1year months until recently when I upgraded the SSD and cleaned the fans. Since then it has become absolutely unbearable, it raises fan speeds even at very low processor loads and temperatures. It increases the speed to 3.5/4k RPM at random even if I'm just doing web surfing with some 10 tabs and a IntelliJ IDEA open. Only time it works as it should is when I'm on battery, but as soon as soon as I plug it in, it increases the fan speed. Every time I check and uncheck the CoolBoost option it quiets down the fans for a second just to increase the speed AGAIN.

This is absolutely unacceptable, the laptop is just 1 year old and it's already behaving erratically. It never gets to shut down because it's not actually overheating, it just stupidly thinks it is overheating. I tried the service center but still they haven't found any problem. 

Any help is GREATLY appreciated, please, I've tried everything, even tried replacing the thermal pasting and NOTHING has worked. Please help me out.

See the temperature and fan speed: 

Your laptop is not overheating as its running pretty cold, are the fans making any bearing noises or overspinning as that is a fan problem that the laptop is compensating to keep the heat down and spinning at those speeds. Otherwise you must have done something internally to either one of the sensors or the fans as that should not be happening. I've opened my AN515-56 many times and its only a few months old and nothing like that is happening to my laptop. Try to take the thermal module out and clean the old paste and put a high quality paste like the Thermal Grizzly Kryonaut Extreme paste and then check the fans and/or replace one or both of them? As they are available on Amazon and/or eBay. 

@SauravPadghan

Kindly follow the details from link given below:

https://www.makeuseof.com/tag/5-silence-noisy-laptop-fan/

https://www.myfixguide.com/fix-laptop-fan-noise/

If your laptop is in warranty you can contact the warranty dept.     Go to the website support.acer.com - chose your country.   On the new page - scroll down -  click on "contact support".  Scroll down.  You can find the phone no to contact the warranty dept. 

If it is out of warranty, please contact local store or

Go to the website support.acer.com - chose your country.   On the new page - scroll down -  Click on  "Repair My Acer" - Request to have your Acer product repaired.   There will be charges for repair. 

Additional info to contact Acer Store:  Please visit the website - support.acer.com - chose your country - click on shop.   You can buy desktop, laptop, monitor and accessories.  Alternatively,  on the top right corner you can find the phone no to contact Acer store.   For the parts which are not available on Acer store, you have to contact local store.

@SauravPadghan

Kindly follow the details from link given below:

https://thenoisefix.com/acer-predator-helios-300-fan-noise/