It looks like that you need to re move the ould thermal paste  and re apply the thermal paste  to the cpu if you want to have a go there is  probably somthing on YouTube showing how to do it  but before you do try do you still have a warranty on it from dell as it will void  the warranty if you do allso I'm not responsible for anything that happens to the laptop if you try it 

We have cleaned the old thermal paste and reapplied it, but the fan is still making noise.
Any other options?
Thanks

AGESL,

Click here and update the system bios to see if that will resolve the fan noise issue.

Having same issue.  I always had loud fan noise on my new Dell XPS 15 2 in 1, but like a heavy breeze sound. Another loud sound just popped 1 hour ago, a loud, low fan noise like the fan wasn't balanced. Sounds like a 80's fan noise 'brrrrrrrrrrrrrrrrrrrrrr'.

It was doing it when i was raising my computer to switch it in tablet mode, but now it's permanent and it's clearly terrible :/. My firmware is updated, nothing in terms of software has changed since the sound started. Anybody had that kind of issue? Any recommandations ? I just bought this computer 2 months ago. Thank you.                                                                     OneCognizant Cognizant