I know this is a problem for most JDM solers so i thought i do a how to on it .
You will need -
Phillips screw driver
White spirt
Cotton buds
Litiuim Grease
Before you start you may find it easier to remove the roof.
1. Start by removing the centre panel under the rear window, this is easy and requires you to just pull it off.
2.Now you will see two screws holding each of the speakers cover panels , remove these and the pull the panel forwards and it will also pop off.
3.Now open the storage bins and remove the 4 screws in the bottom (2 in each bin) and close the bins, then look down where the front part of the bin compartment meets the carpet and there is two more screws to remove (one on each side) , finally the last two which are located where the centre consol meets the bin part.
4.now putting your hands behind the bin compartment pull towards you , again it will pop off and you can remove it.
5.The fan is located on the left hand side behind the plastic quarter panel , you will notice some more screws holding this in remove these and the panel will pop out , remember to disconnect the fan first , which is easy as it is a plug coupler.
6.You will notice the fan is held in position by a metal braket , remove the 2 screws and the fan will fall off
7.Now to strip the fan by removing the 4 screws and open it up , you will notice there will be ALOT of crap in there so strat by cleaning that all away using the cotton buds and white spirit. Remember to remove the dirt from the thermistor.
8.There is a metal pin that seats in a 2 holes which the fan rotates in, pack grease into these holes and reasemble.
9.take the fan on its own an plug it in to make sure its silent , then reassenble in the reverse order
hope it helps