The Asus gaming laptops (and all of them, really) get hot. It's just what they do. Now, if it is abnormally hot, which it sounds like it is for your case, then the laptop needs to be taken apart and cleaned. I just repaired the same model for a friend of mine, and it was filthy on the inside, even though the person themselves was a clean freak. The fan ports on the laptop get clogged up easily and quickly, so a good cleaning should help out a lot. I highly doubt it is your fan.