To be certain, you should:
* Consult your owner's manual: This is the best resource for the specific location on your vehicle.
* Use a repair manual: A Haynes or Chilton repair manual for your specific year and engine will have diagrams showing the PCV valve location.
* Search online: Search for "[your engine size] 2000 Chevy Malibu PCV valve location" on image search engines like Google Images or Bing Images. You may find pictures that will help you identify it.
Remember to be careful when working near the engine. It can be hot and there are other parts that could be damaged if mishandled.