2003 Saturn Ion cabin air filter

There is - it is behind the glove box. You need to open the glove box as far as it will go, then squeeze the sides in to allow the "stop tabs" to pass on either side and open even further. Once down all the way you can look inside and there is a small thin door about 2 inches high and about as wide as the glove box. There are two tabs on the door (left and right). Push down on the tabs and the door will open. You will see the side of the filter. Just pull it out and replace.