2007 Cadillac STS Owner's Manual - Page 393

Engine Overheating {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 a pressure cap, make sure it is hand-tight and fully seated. There are two engine hot messages that could be displayed in the Driver Information Center (DIC). See DIC Warnings and Messages on page 264 for more information. If the engine is overheating, then you will find a coolant temperature gage and a coolant warning light on the instrument panel. See Engine Coolant Temperature Gage on page 251 and Engine Coolant Temperature Warning Light on page 251 for more information. Coolant Surge Tank Pressure Cap Notice: If the pressure cap is not tightly installed, coolant loss and possible engine damage may occur. Be sure the cap is properly and tightly secured. The coolant surge tank pressure cap must be fully installed on the coolant surge tank. See Engine Compartment Overview on page 373 for more information on location. 393