The radiator drain plug on a 2003 Cadillac DeVille is located at the
bottom of the radiator, usually on the
driver's side. However, it's not always easily visible. You might need to get down low and possibly use a flashlight to locate it. It's typically a small, threaded plug.
Important Note: Before attempting to drain the radiator, ensure the engine is completely cool. Hot coolant can cause serious burns.
