Engine Coolant - Chevrolet 4500 HD 2023 Manual

250 Vehicle Care
Air Cleaner Indicator Light
When the air cleaner indicator light comes
on, check the air cleaner element. If the air
cleaner element is clogged, replace the air
cleaner element.
See Vehicle Messages 0 67.
See Maintenance Schedule 0 312.

Engine Coolant

Protection of Engine Against Overcooling
Overcooling of the engine not only
accelerates wear of the vital engine parts
but also hurts fuel economy.
Engine Coolant in Cold Weather
To prevent the engine damage due to
freezing of the engine coolant, mix the
coolant and water at the ratio of 50/50.
Replace rubber hoses whenever they crack
or are damaged; even minor cracks allow
engine coolant solution to leak.
Warning
If your engine cooling system overheats,
see Engine Overheating 0 254. Continued
operation of the engine even for a short
Warning (Continued)
time may result in a fire and the
possibility of personal injury and/or
severe vehicle damage.
You and others could be seriously injured.
Your vehicle has an engine coolant recovery
system, expansion bottle and/or an engine
coolant reserve tank system. Engine coolant
in the system expands with heat and
overflows into the reserve tank. When the
system cools, engine coolant is drawn back
into the radiator.
The engine cooling system has been filled at
the factory with a quality engine coolant.
It is important to use proper engine coolant
to prevent damage to engine cooling system
components. The engine cooling system is
designed to use engine coolant rather than
plain water. See Recommended Fluids and
Lubricants 0 330.
See the Maintenance Schedule to find out
when the engine coolant must be replaced.
Note that changing the engine coolant is
needed to replenish the rust inhibitors to
make certain that all parts of the engine
cooling system work well.
(Continued)
Warning
Check, replenish or change the engine
coolant only after the engine has
sufficiently cooled down.
Do not loosen or remove the cap of the
radiator or engine coolant reserve tank
cap when the engine coolant is still hot.
Hot vapor or boiling water may burst out
and cause a burn.
When removing the radiator cap or
engine coolant reserve tank cap, use a
thick cloth to cover the cap and turn it
slowly.
Engine coolant is toxic and must not be
ingested. If the engine coolant is
mistakenly ingested, seek prompt medical
attention.
If the engine coolant gets in your eyes,
rinse your eyes immediately with a large
amount of water for 15 minutes or
longer. Also, if your eyes are still irritated
or otherwise feel abnormal, seek
immediate medical attention.
(Continued)