Call Dell tech support as this could very well be a bad fan (bushing or bearing). And do it asap so that it will be taken care of before the warranty ends.
Recently, the fan on my 5530 (i9) has started making loud noises - almost to the point of sounding like there is a "playing cards in the spokes" and ramps back down to silent from one moment to the next. There seems no rhyme or reason for the fan going nuts and it'll sometimes go crazy when not doing anything. Any thoughts? My warranty is expiring in mid November, so if there is an issue, I'd just as soon have Dell take care of it. I'm currently running Win11, but the issue started with Win10. No heavy duty processing (normal office apps and the like).
Precision 5530 fan issue