Remove the hush panel under the RH side of the dash (3-4 7mm screws). Next to the blower motor there is a "door" about an inch wide and 6-8" deep retained by one gold colored 5.5mm screw in the front and a tab in the rear. Take the door (cover?) off and you'll see an opening one of the two filter panels drops out of....pull it out then pull the other panel rearward then down and out.