I figure the glove box needs to drop first (two side pins like a Nissan ?)
Click on installation at the bottom of the page. http://ecat.arvinmeritor.com/smartlink/?partnum=C15439
Procedure was SIMPLE. Open glove box remove the two inner STOPPER clips (pulling into the glovebox). Glovebox door swings open more and behind is the cover of the blower unit (remove cover plate) and the two frameed pollen filters will pull and slide out.