Black plate (22,1)
DURAMAX Diesel Engine (LML/LGH) - 2011
10-22
Vehicle Care
Engine Coolant
The cooling system in the vehicle is
filled with DEX-COOL
®
engine
coolant. This coolant is designed to
remain in the vehicle for 5 years or
240 000 km (150,000 mi), whichever
occurs first, if you add only
DEX-COOL extended life coolant.
The following explains the cooling
system and how to add coolant
when it is low. If there is a problem
with engine overheating, see
Engine
Overheating on page 10
‑
26
.
A 50/50 mixture of clean, drinkable
water and DEX-COOL coolant will:
.
Give freezing protection
down to
−
37°C (
−
34°F)
.
Give boiling protection
up to 129°C (265°F)
.
Protect against rust and
corrosion
.
Help keep the proper engine
temperature
.
Let the warning lights and
gauges work as they should
Notice:
Using coolant other than
DEX-COOL may cause premature
engine, heater core, radiator and
fuel operated heater (van models
only) corrosion. In addition,
the engine coolant may require
changing sooner, at 50 000 km
(30,000 mi) or 24 months,
whichever occurs first. Any
repairs would not be covered by
the vehicle warranty. Always use
DEX-COOL (silicate-free) coolant
in the vehicle.
What to Use
Use a 50/50 mixture of clean,
drinkable water and DEX-COOL
coolant which will not damage
aluminum parts. If using this
mixture, nothing else needs to be
added.
{
WARNING
Adding only plain water or some
other liquid to the cooling system
can be dangerous. Plain water
and other liquids, can boil before
the proper coolant mixture will.
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.
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