Cadillac 2009 STS, Owner'S Manual

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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.
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