Cadillac 2008 CTS - Manual (Page 312)

Adding Coolant
If more coolant is needed, add the proper DEX-COOL ®
coolant mixture at the surge tank, but only when the
engine is cool.
{ 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 and fully seated.
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 5-14 for more
information on location.
Engine Overheating
There are two engine hot messages that may be
displayed in the Driver Information Center (DIC).
See DIC Warnings and Messages on page 3-54 for
more information.
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