Are there cabin air filters for this year of pick-up? Or did chevy stop using them in 2002 or 03. If there are, where are they located?

 

they stopped using them about 2002 i believe .

 

Is there any way to modify the system to install air filters. I thought I remember seeing a link to the Diesel Forum that showed how this could be done. Aftermarket and without butchering the system. Anybody?
Thanks again Michael J.