GMC Terrain 2025 - Engine Overheating

GMC Terrain/Terrain Denali Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-18552429) - 2025
234 Vehicle Care
1. Turn the pressure cap slowly
c
o
unterclockwise. 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. Fill the coolant surge tank with the proper
mixture to the mark pointed to on the front
of the coolant surge tank.
4. With the coolant surge tank pressure cap
off, start the engine and let it run until you
can feel the upper radiator hose getting
hot. Watch out for the engine cooling fans.
By this time, the coolant level inside the
coolant surge tank may be lower. If the level
is lower, add more of the proper mixture
to the coolant surge tank until the level
reaches the mark pointed to on the front of
the coolant surge tank.
5. Replace the pressure cap tightly.
Caution
If the pressure cap is not tightly installed,
co
olant loss and engine damage may
occur. Be sure the cap is properly and
tightly secured.
Engine Overheating
Th
e vehicle has an engine coolant temperature
gauge on the instrument cluster and overheat
messages in the Driver Information Center
(DIC) to warn of engine overheating. See Engine
Coolant Temperature Gauge 389.
The decision may be made not to lift the
hood when the engine coolant temperature
gauge is in the overheat zone or an engine
overheat DIC message displays, but instead
to get service help right away. See Roadside
Assistance Program 3302.
If the decision to lift the hood is made, make
sure the vehicle is parked on alevel surface.
Then check to see if the engine cooling fan(s)
are running. If the engine is overheating, the
fan(s) should be running. If they are not, do
not continue to run the engine, and have the
vehicle serviced.
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 Steam Is Coming from the
En
gine Compartment
{ Warning
S
team and scalding liquids from ahot
co
oling 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 Steam Is Coming from the
En
gine Compartment
If the engine coolant temperature gauge is in
the overheat zone or an engine overheat DIC
message is displayed but no steam can be seen
or heard, the problem may not be too serious.
Sometimes the engine can get alittle too hot
when the vehicle:
•
Climbs along hill on ahot day
•
Stops after high-speed driving
•
Idles for long periods in traffic
•
Tows atrailer