2004 Cadillac CTS Owner's Manual - Page 316

Adding Coolant If you need more coolant, add the proper DEX-COOL® coolant mixture at the surge tank, but only when the engine is cool. Engine Overheating There are three engine hot messages that may be displayed in the Driver Information Center (DIC). See DIC Warnings and Messages on page 3-61 for more information. {CAUTION: You can be burned if you spill coolant on hot engine parts. Coolant contains ethylene glycol, and it will burn if the engine parts are hot enough. Do not spill coolant on a hot engine. When replacing the pressure cap, make sure it is hand-tight. Overheated Engine Protection Operating Mode This emergency operating mode allows your vehicle to be driven to a safe place in an emergency situation. Should an overheated engine condition exist, an overheat protection mode which alternates firing groups of cylinders helps prevent engine damage. In this mode, you will notice a significant loss in power and engine performance. A low coolant and/or engine overheat indicator will communicate that an overheat condition exists. Towing a trailer in the overheat protection mode should be avoided. Coolant Surge Tank Pressure Cap Notice: If the surge tank pressure cap is not tightly installed, coolant loss and possible engine damage may occur. Be sure the cap is properly and tightly secured. Notice: After driving in the overheated engine protection mode, to avoid engine damage, allow the engine to cool before attempting any repair. The engine oil will be severley degraded. Repair the cause of the coolant loss and change the oil. See ''Engine Oil'' in the Index. 5-30