Ok I just send e-mail to galaxytechus this is what they said:
"We are sorry but we do not replace just the fan. Standard warranty is 2 years upon purchase, if it is within that period then it is likely to be covered by warranty. To request for a replacement, please visit our website, create an account and register your product, then create a ticket for replacement request. It will go to a process of approval, once approved, you will receive an email from us that contains your RMA number and the address where you need to ship the defective card."