To be sure, it's best to:
* Consult your owner's manual: This will provide a diagram showing the location of all fluid reservoirs.
* Use an online repair manual: Websites like Chilton or Haynes offer detailed diagrams and instructions for your specific year and model.
* Look for a diagram online: Search for "2003 Chevrolet Impala power steering reservoir location" with images.
Finding a clear image online will likely be the quickest and easiest way to locate it. Good luck!