I'm also experiencing the same behavior. When plugged in, the fan would turn on even though CPU/HDD temperatures are very low, below than 90F.
The behavior is observed mostly on Windows 10, and as soon as I unplug the chargers, fans would first calm down, then stop after a minute or so, at which point the the laptop remains completely silent. Plugging the charger back would kick the fan on again after a few minutes.
The same problem happens pn Linux (Ubuntu), but much less pronounced than on Windows; fan noise is inexistant but would slightly kick in when plugged in. Otherwise, it is completely silent unplugged (for light tasks such as browsing, video etc.).
I uninstalled all Dell utilities on WIndows (something recommended in another forum), and it did reduce the fan noise when plugged in but didn't completely eliminate it.
hey all, i just gotten my 9370 and also experienced loud fan noises when plugged in usb c via my monitor.
i tried playing around with the settings and found this solution helped to reduce the fan noise significantly.
dell power manager > thermal management > quiet
i'm not sure how this would affect performance yet but at least i don't have to keep bearing with the noticeably noisy fans.
Just received mine xps 13 9370 and the fans haven't stopped ... really annoying. Has anybody found what is this noise all about if processor is not loaded?