Chevrolet 4500HD Series 2019 Manual page 256

Warning (Continued)
eyes are still irritated or otherwise
feel abnormal, seek immediate
medical attention.
If the engine coolant gets on your
skin, rinse it off using a soap with
a large amount of water. Also,
if abnormality is seen, seek
medical attention.
Engine coolant is flammable, and
therefore, it must be kept away
from flames and other heat
sources. Engine coolant also
could ignite if it comes in contact
with a hot surface, such as the
exhaust manifold. Exercise
caution to prevent this from
happening.
You and others could be seriously
injured.
Preparing Engine Coolant
To prevent engine damage due to
freezing of the engine coolant and
to protect the cooling system from
corrosion, use a mixture of the
recommended type antifreeze and
water. If the engine of the vehicle is
at 30 °C ( 22 °F) or above, the
coolant concentration should be
50%. Direct use of 50/50
Pre-diluted product which is already
diluted to 50% concentration is
recommended. If the outside
temperature engine or vehicle is
used at 30 °C ( 22 °F) or below,
coolant concentration of 55% is
recommended.
It is the owner s responsibility to:
Maintain the engine cooling
system freeze protection at or
above 30 °C ( 22 °F) (at or
below 30 °C ( 22 °F) in colder
climates to ensure protection
against corrosion and loss of
engine coolant from boiling.
A 50/50 (55/45 for colder
climates) mixture of the
recommended type antifreeze
and water will provide freeze
protection to at or above 30 °C
( 22 °F), (at or below 30 °C
( 22 °F) in colder climates) and
boil protection to 128 °C
Vehicle Care
(262 °F). Periodic replacement
of engine coolant is needed to
replenish the anticorrosion
additives that wear out with use.
Engine coolant that has become
dark in color shows that it needs
to be changed.
Use only the recommended
coolant. See Recommended
Fluids and Lubricants 0 349.
Do not use methanol-base
antifreeze, alcohol or plain water
alone in your vehicle at any time.
They will boil at a lower point
than that at which the engine
coolant temperature gauge will
warn of overheating, and they do
not provide proper protection
against corrosion.
Engine Coolant Quantity
For the quantity of engine coolant,
see Capacities and Specifications
0 357. After changing the engine
coolant, check that the engine
coolant is up to the specified level.
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