Where is the coolant plug on a 1999 Cadillac Seville?

The coolant drain plug location on a 1999 Cadillac Seville depends on whether it has the Northstar V8 engine or not. There isn't a single universal location.

To find it, you'll need to:

1. Identify your engine: Check your vehicle's paperwork or the engine bay itself. The Northstar V8 is a distinctive engine.

2. Consult a repair manual: A repair manual specific to your 1999 Cadillac Seville (with the correct engine type) will show you a diagram of the cooling system, clearly marking the drain plug's location. This is the most reliable method. You can find these manuals online or at auto parts stores.

3. Look in the lower part of the engine: The drain plug is generally located at the lowest point of the engine block or radiator. It's usually a bolt or a similar fitting.

Without a repair manual, providing a precise location is impossible and attempting to locate it blindly can lead to damaging other components. Therefore, using a repair manual is crucial.