Look at the linked photo
I had a lot of troubles like the cooling wasn’t working properly, but the part cooling fan was installed in the direction shown in the photo, and the wind was flowing from the right side to the left side of the photo. I contacted support and was told that the fan label was visible and correct. Even if it is operated with M106, the wind is flowing in the opposite direction instead of blowing toward the nozzle. How about your machine?
Now, in fact, with the fan installed in the opposite direction of the photo, the M106 S255 is blowing wind towards the nozzle.