To locate it precisely:
1. Consult a repair manual: A Chilton's or Haynes manual specific to your 1999 Chrysler Town & Country will show you a diagram with its exact location. This is the most reliable method.
2. Look closely at the valve cover: Once you've located the valve cover (it's the top of the engine), carefully examine all the hoses and connections emanating from it. The PCV valve is usually near the center or towards the back of the valve cover.
3. Follow the hose: You can sometimes trace the hose leading from the PCV valve to the intake manifold. This hose is typically smaller than others on the engine.
Caution: The engine will be hot after running. Allow it to cool completely before attempting to locate or replace the PCV valve.