The radiator drain plug on a 1998 Cadillac Deville with a 4.6L V8 engine is located at the
bottom of the radiator, on the driver's side. It's usually a small, easily accessible plug. It might be a simple bolt or a slightly more intricate fitting. Look carefully at the bottom of the radiator; it's typically near one of the lower radiator hoses.
Important Note: Before attempting to drain the radiator, ensure the engine is completely cool to avoid serious burns. Have a drain pan ready to catch the coolant.
