2002 Cadillac Eldorado Owner's Manual - Page 286

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 2.5 inches (6.4 cm) below the base of the fill neck. Use a flashlight as necessary to see into the tank. The surge tank is located next to the engine block on the passenger's side of the vehicle. For more information on location, see "Engine Compartment Overview" in the Index. If the CHECK COOLANT LEVEL message appears on the Driver Information Center (DIC), 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. For more information, see "Check Message, Coolant Level" in the Index. 6-26