Chevrolet Silverado 4500HD/5500HD/6500HD Owner Manual (GMNA-
Localizing-U.S.-12102101) - 2019 - crc - 10/2/18
Vehicle Care
305
engine coolant temperature
gauge indicates approximately
90 °C (195 °F).
By this time, the coolant level
inside the coolant surge tank
may be lower. If the level is
lower, slowly add more of the
proper mixture to the coolant
surge tank until it reaches the
indicated mark.
5. Replace the pressure cap. Be
sure the pressure cap is
locked.
6. Verify coolant level after the
engine is shut off and the
coolant is cold. If necessary,
repeat coolant fill procedure
Steps 1
–
6.
If the coolant level is still low after
having followed these steps twice,
have the coolant system checked by
a certified technician at the dealer
for a possible leak.
Caution
If the pressure cap is not tightly
installed, coolant loss and engine
damage may occur. Be sure the
cap is properly and tightly
secured.
Engine Overheating
There is an engine coolant
temperature gauge on the
instrument cluster.
If Steam Is Coming from the
Engine Compartment
{
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,
(Continued)
Warning (Continued)
including the pressure cap, is hot.
Wait for the cooling system and
pressure cap to cool.
Caution
Do not run the engine if there is a
leak in the engine cooling system.
This can cause a loss of all
coolant and can damage the
system and vehicle. Have any
leaks fixed right away.
If No Steam Is Coming from
the Engine Compartment
A Driver Information Center (DIC)
message, along with a low coolant
condition, can indicate a serious
problem.
If there is an engine overheat
warning and the vehicle does not
have a low coolant condition, and
no steam is heard or seen, the
