Ive had this issue with my Watercooler where one of the fans to it rubs the cooler itsself causing an awful grinding noise, this only happens when the fan is turned up to high RPM. Ive had a thought of using sticky pads "used for crafting" as a way to seperate the fan from the radiator itself, and create room. Would this work? or could it be a risk of something going wrong? a last resort is replacing the entire unit. Which is something the store might do.