Technical data

Black plate (22,1)
Chevrolet/GMC Duramax Diesel Supplement (GMNA Localizing-U.S./Canada-
7132827) - 2015 - CRC - 10/21/14
10-22 Vehicle Care
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 full
turn. If a hiss is heard, wait for
that to stop. A hiss means there
is still some pressure left.
2. Keep turning the pressure cap
slowly, and remove it.
3. Slowly fill the coolant surge tank.
Do not let the coolant level go
above the seam in the tank until
after the engine comes to
operating temperature in Step 4.
4. With the coolant surge tank
pressure cap off, start the
engine and let it run until the
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
proper level.
On pickup models, slowly
continue to add coolant so it
goes into the non-pressurized
side (fender side) of the coolant
surge tank until it reaches
one-third of the capacity.
Fill the coolant surge tank to the
following levels:
.
At or above the MIN mark
on the pickup.
.
To the COLD FILL mark on
the van.
5. Replace the pressure cap. Be
sure the pressure cap is
hand-tight and fully seated.
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
possible 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. See the owner
manual.