2000 Cadillac Seville Owner's Manual - Page 300

Checking Coolant CAUTION: Turning the surge tank pressure cap when the engine and radiator are hot can allow steam and scalding liquids to blow out and burn you badly. Never turn the surge tank pressure cap -- even a little -- when the engine and radiator are hot. The vehicle must be on a level surface. When your engine is cold, the coolant level should be at the FULL COLD mark, which is at or above the fill mark at the edge of the surge tank. The engine coolant surge tank is located on the driver's side of the engine. The cooling system is under a lot of pressure when it is hot. If the CHECK COOLANT LEVEL message appears on the Driver Information Center, you will need to add coolant. If the CHECK COOLANT LEVEL message comes on and stays on, it means you're low on engine coolant. 6-24