2004 Chevy Venture air cleaner filter

If you open the hood, you will see a large black hose from the intake manifold/ IF you follow it, it will lead you to the air filter box. It is square. I believe your year has clips that hold the box closed. Loosten the clips and remove the top of the air filter. Just remove and replace the old one and reverse the process. Here is a picture of the filter so you know what you are looking for.

Let me know if this helps or if you have other questions. Joe