Chevrolet GMC Duramax 2023 Manual page 54

Caution (Continued)
to the engine cooling system and the
vehicle, which would not be covered by
the vehicle warranty.
Never dispose of engine coolant by putting
it in the trash, or by pouring it on the
ground or into sewers, streams, or bodies of
water. Have the coolant changed by an
authorized service center, familiar with legal
requirements regarding used coolant
disposal. This will help protect the
environment and your health.
Checking Coolant
The coolant surge tank (2) is in the engine
compartment on the driver side of the
vehicle. See Engine Compartment Overview
0 46 for location.
The vehicle must be on a level surface.
When the engine is cold, the coolant level
should be at the indicated mark.
Adding Coolant
Caution
If coolant is changed or added, always
add enough to fill the system completely
or engine damage may occur.
If more coolant is needed, add the proper
DEX-COOL coolant mixture at the surge tank,
but be careful not to spill it.
Warning
Spilling coolant on hot engine parts can
burn you. Coolant contains ethylene
glycol and it will burn if the engine parts
are hot enough.
Vehicle Care
Warning
Steam and scalding liquids from a hot
cooling system are under pressure.
Turning the pressure cap, even a little,
can cause them to come out at high
speed and you could be burned. Never
turn the cap when the cooling system,
including the pressure cap, is hot. Wait
for the cooling system and pressure cap
to cool.
If no coolant is visible in the surge tank, add
coolant as follows:
1. Remove the coolant surge tank pressure
cap when the cooling system, including
the coolant surge tank pressure cap and
upper radiator hose, is no longer hot.
Turn the pressure cap slowly
counterclockwise about one-half turn. If a
hiss is heard, wait for that to stop.
A hiss means there is still some
pressure left.
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