To find it:
1. Park the car on a level surface and let the engine cool completely. Hot coolant can cause serious burns.
2. Locate the radiator: It's a large metal component at the front of the engine compartment.
3. Look closely at the bottom of the radiator on the driver's side. The drain plug is usually a small bolt or plug, often with a square or hex head. It might be slightly recessed.
4. If you can't easily locate it, consult a repair manual specific to your 1999 Chrysler Sebring. A Haynes or Chilton manual will have diagrams and detailed instructions.
Important Note: Always use caution when working with coolant. It's toxic and can cause burns. Wear appropriate safety gear, and properly dispose of the used coolant according to local regulations.