Chevrolet 4500 HD 2023 Manual page 252

Warning (Continued)
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 (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
0 330.
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
Vehicle Care
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 0 339. After
changing the engine coolant, check that the
engine coolant is up to the specified level.
Warning
For storage, close the cap of coolant
container securely and keep it in a place
inaccessible to children.
You and others could be seriously injured.
Using any coolant other than that
recommended by your dealer could cause
damage to the engine, radiator or heater
core. In particular, use of coolants containing
borate salts or silicates may result in engine
or radiator corrosion, causing engine coolant
leaks and other problems.
To dilute the coolant, use distilled water or
deionized water.
Do not use the coolant at any coolant
concentration other than that specified.
If the coolant concentration is 60% or
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