Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-16504481) - 2023 - CRC - 9/26/22
54 Vehicle Care
2. Keep turning the pressure cap slowly,
and remove it.
3. Slowly fill the coolant surge tank (2). Do
not let the coolant level go above the
indicated mark 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 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.
Cooling System (Low Temperature
Cooling Circuit)
The cooling system allows the diesel fuel
and diesel emission fluid injector to
maintain the correct working temperature.
1. Engine Cooling Fan (Out of View)
2. Low Temperature Cooling Circuit
Coolant Surge Tank and Pressure Cap
3. Engine Coolant Surge Tank and
Pressure Cap
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Warning
Do not touch heater or radiator hoses,
or other engine parts. They can be very
hot and can burn you. Do not run the
engine if there is a leak; all coolant could
leak out. That could cause an engine fire
and can burn you. Fix any leak before
driving the vehicle.
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