GMC Sierra 2014 Owner's Manual page 388

10-22 Vehicle Care
Caution (Continued)
Too much water in the mixture
can freeze and crack engine
cooling parts. The repairs would
not be covered by the vehicle
warranty. Use only the proper
mixture of engine coolant
for the cooling system. See
Recommended Fluids and
Lubricants on page 11-13.
Never dispose of engine coolant by
putting it in the trash, 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 is located in
the engine compartment on the
passenger side of the vehicle. See
Engine Compartment Overview on
page 10-6.
The vehicle must be on a level
surface when checking the coolant
level.
Check to see if coolant is visible in
the coolant surge tank. If the coolant
inside the coolant surge tank is
boiling, wait until it cools down. The
coolant level should be at or above
the FULL COLD mark. If it is not,
there may be a leak in the cooling
system.
If coolant is visible but the coolant
level is not at or above the FULL
COLD mark, see How to Add
Coolant to the Coolant Surge Tank
for Gasoline Engines, following.
5.3L V8 Shown, 4.3L V6, 6.0L V8,
and 6.2L V8 Similar