@tmjohari, I would like a link to the fan that you are thinking of. You should be able to do it yourself, if you are careful, and you have plenty of time. Disassembling the G53's takes a lot of time, and it is complicated (lots of tiny screws). It's not excessively difficult, just time-consuming. To get to the fans, you will have to completely disassemble the computer, beyond even that required to upgrade the HDD and memory. For this reason, I would echo @Pitcher@ASUS's statement and suggest you contact your local service center.