Coolant Surge Tank Pressure Cap; Engine Overheating - Cadillac 2004 CTS Owner's Manual

Adding Coolant
If you need more coolant, add the proper DEX-COOL
coolant mixture at the surge tank, but only when the
engine is cool.
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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.

Coolant Surge Tank Pressure Cap

Notice: If the surge tank pressure cap is not tightly
installed, coolant loss and possible engine damage
may occur. Be sure the cap is properly and
tightly secured.
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Engine Overheating

®
There are three engine hot messages that may be
displayed in the Driver Information Center (DIC).
See DIC Warnings and Messages on page 3-61
for more information.
Overheated Engine Protection
Operating Mode
This emergency operating mode allows your vehicle to
be driven to a safe place in an emergency situation.
Should an overheated engine condition exist, an
overheat protection mode which alternates firing groups
of cylinders helps prevent engine damage. In this
mode, you will notice a significant loss in power and
engine performance. A low coolant and/or engine
overheat indicator will communicate that an overheat
condition exists. Towing a trailer in the overheat
protection mode should be avoided.
Notice: After driving in the overheated engine
protection mode, to avoid engine damage, allow
the engine to cool before attempting any repair.
The engine oil will be severley degraded.
Repair the cause of the coolant loss and change
the oil. See ''Engine Oil'' in the Index.