Cadillac 2007 STS Owner's Manual page 392

Checking Intercooler System Coolant
(4.4L V8 STS-V Engine Only)
See Engine Compartment Overview on page 373
for the location of the intercooler system
pressure cap.
392
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 visible in the intercooler fill neck.
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 396 for instructions on
how to add coolant to the intercooler fill neck.