It seems to be accessed from inside the front passenger footwell - try http://furmanka.blogspot.com/2006/08/20k-swonick.html for pictures. Oops - no Dead Wrong. I just did the job and it took about 30 mins. Park wipers in vertical position
Open bonnet / hood
Disconnect battery neg terminal
Working inside engine compartment...
Remove plastic tray which runs across back of engine compartment under wiper mechanism - remove 3 screws and ease forwards and to left
Pull on bottom tab just to left of central plastic vertical bar on pollen filter to bring filter holder forwards about 3 or 4 cm
Slide, wiggle & fiddle holder and filter to LEFT until it comes out of wiper mechanism area Remove old filter and insert new one into holder, then gently guide and wiggle the filter holder back along the space below the wiper mechanism until it is all the way to the right, and then push the lower edge until it clicks back into place.
Replace plastic tray and replace the 3 screws. Reconnect battery. Done.