2009 Cadillac STS-V Owner's Manual - Page 360

3. Add the proper DEX-COOL® coolant mixture to the fill neck, until the coolant reaches the COLD FILL line on the fill neck. With the Intercooler System pressure cap off, start the engine and let it run for a couple of minutes. Then turn the engine off. By this time, the coolant level inside the fill neck may be lower. If the level drops to where coolant is no longer visible in the horizontal tube section of the fill neck, with the engine off add more of the DEX-COOL® coolant mixture to the fill neck until the level is again visible in the horizontal tube section. 4. Then replace the pressure cap. Be sure the pressure cap is hand-tight and fully seated. If the coolant is not at the proper level when the system cools down again, see your dealer. 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. 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 5-12 for more information on location. Engine Overheating The vehicle has several indicators to warn of engine overheating. There are two engine hot messages that could be displayed in the Driver Information Center (DIC). See DIC Warnings and Messages on page 3-79 DIC Warnings and Messages 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 3-65 and Engine Coolant Temperature Warning Light on page 3-64 for more information. 5-34