1998 Cadillac Catera Owner's Manual - Page 271

Checking Coolant = I 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. -- -- When your engine is cold, the coolant level should at be the KALTKOLD line (seam). The surge tank is located behind the air cleaner on the passenger's sideof the engine. 1 ]I I I If the lightcomes on, it means you're low on engine coolant. The cooling system when hot is under aof pressure. lot If the low coolant warning light on the instrument panel appears, you will need to add coolant. For more information, see "Low Coolant Light" in the Index. 6-22