Here is a quick post on how to replace a noisy CPU fan on an ASUS F3J series laptops, the replacement is so easy that it really doesn’t need a how to guide.
I purchased the new fan on eBay (as usual) for $7.70 including postage.
Remove the following seven screws as circled, the circled blue screw is a unique extra long screw.
The exposed old existing fan, to remove unscrew three screws.
The air-hole when the old fan is removed.
Finally, the new fan inserted and screwed into place.