2006 Cadillac STS-V Owner's Manual - Page 342

Checking Intercooler System Coolant (4.4L V8 STS-V Engine Only) Adding Coolant If you need more coolant, add the proper DEX-COOL® coolant mixture at the intercooler fill neck, but only when the engine is cool. See Cooling System on page 5-33 for instructions on how to add coolant to the intercooler fill neck. {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. See Engine Compartment Overview on page 5-12 for the location of the intercooler system pressure cap. Notice: This vehicle has a specific coolant fill procedure. Failure to follow this procedure could cause your engine to overheat and be severely damaged. Park the vehicle on a level surface and turn off the engine. When the engine is cold, the coolant level should be at or above the FULL COLD line. The FULL COLD line has an arrow pointing to it. 5-30