To be certain, you should:
1. Consult your owner's manual: This is the best resource for the exact location specific to your vehicle's engine.
2. Use a repair manual or online diagrams: Search online for "2005 Dodge Caravan [3.3L or 3.8L engine] PCV valve location" with images. This will give you visual references.
3. Look at the valve cover itself: The PCV valve is usually fairly easy to spot once you locate the valve cover; it will be a small, easily accessible valve with a hose attached.
Remember to be careful when working near hot engine parts. Let the engine cool completely before attempting to locate or replace the PCV valve.