You using EKWB water cooling system, please refer the EKWB manual for the fan settings. It should be set 100% if I remember correctly, please check manual to double check. The CPU FAn is conencted to the water cooling fan, correct?
For Rear Fan, please check if it is working? Did it turn on if you plug the Rear Fan to another CHA_FAN connector? Did you try another fan to replace the current rear fan?
Please run as administrator when you install AI Suite 3, beecause it needs administrator rights to install correctly
Sincerely,
Legolas