You went now where thermo located in Chevy Prizm 2001?

The thermostat on a 2001 Chevy Prizm is located on the engine, typically near the top of the engine block, at the back of the engine, near the firewall. It's usually housed in a plastic or metal housing. It's not easily accessible without some mechanical knowledge and possibly removing some components.

Because of the location's variance depending on the specific engine (some models used different engines), a picture or a detailed diagram specific to your 2001 Prizm's engine is recommended to be 100% certain. You can find these online through repair manuals (like a Haynes or Chilton manual) or websites dedicated to car repair, by searching for your specific year, make, and model.