Engine Coolant - Hummer 2009 H3 Owner's Manual

Engine Coolant

The cooling system in the vehicle
is filled with DEX-COOL
coolant. This coolant is designed to
remain in the vehicle for five years
or 150,000 miles (240 000 km),
whichever occurs first.
The following explains the cooling
system and how to check and
add coolant when it is low.
If there is a problem with engine
overheating, see Engine
Overheating on page 5-27.
What to Use
{
CAUTION
Adding only plain water to the
cooling system can be dangerous.
Plain water, or some other liquid
such as alcohol, can boil before
the proper coolant mixture will.
CAUTION (Continued)
®
engine
The vehicle's coolant warning
system is set for the proper
coolant mixture. With plain water
or the wrong mixture, the engine
could get too hot but you would
not get the overheat warning.
The engine could catch fire and
you or others could be burned.
Use a 50/50 mixture of clean,
drinkable water and DEX-COOL
coolant.
Use a 50/50 mixture of clean,
drinkable water and DEX-COOL
coolant. If using this mixture,
nothing else needs to be added.
This mixture:
•
Gives freezing protection down
to −34°F (−37°C), outside
temperature.
•
Gives boiling protection up to
(Continued)
265°F (129°C), engine
temperature.
Service and Appearance Care
•
Protects against rust and
corrosion.
•
Will not damage aluminum parts.
•
Helps keep the proper engine
temperature.
Notice: If an improper coolant
mixture is used, the engine could
overheat and be badly damaged.
The repair cost would not be
covered by the vehicle warranty.
Too much water in the mixture
®
can freeze and crack the engine,
radiator, heater core, and
other parts.
Notice: If extra inhibitors
and/or additives are used in the
vehicle's cooling system, the
vehicle could be damaged.
Use only the proper mixture of
the engine coolant listed in
this manual for the cooling
system. See Recommended
Fluids and Lubricants on
page 6-12 for more information.
5-23