GMC Yukon 2025 - Engine Overheating

GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-17942154) - 2025
328 Vehicle Care
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
Caution
Do not run the engine if there is aleak in
t
h
e engine cooling system. This can cause
aloss of all coolant and can damage the
system and vehicle. Have any leaks fixed
right away.
The vehicle has several indicators to warn of
e
n
gine overheating.
There is acoolant temperature gauge and
aengine coolant temperature warning light
in the vehicle's instrument cluster. See Engine
Coolant Temperature Gauge 3110 and Engine
Coolant Temperature Warning Light 3120.
In addition, there are ENGINE OVERHEATED
ST
OP ENGINE, ENGINE OVERHEATED IDLE
ENGINE, and ENGINE POWER IS REDUCED
messages in the Driver Information
Center (DIC).
If the decision is made not to lift the hood when
this warning appears, get service help right
away. See Roadside Assistance Program 3411.
If the decision is made to lift the hood, make
sure the vehicle is parked on alevel surface.
Check to see if the engine cooling fan(s) are
running. If the engine is overheating, the
fans should be running. If they are not, do
not continue to run the engine. Have the
vehicle serviced.
If Steam is Coming from the
Engine Compartment
{ Warning
Steam 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
(Continued)
Warning (Continued)
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
The ENGINE OVERHEATED STOP ENGINE or the
ENGINE OVERHEATED IDLE ENGINE message,
along with a low coolant condition, can indicate
aserious problem.
If there is an engine overheat warning, but no
steam is 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; see Trailer Towing 3286.
If the ENGINE OVERHEATED STOP ENGINE or
the ENGINE OVERHEATED IDLE ENGINE message
appears with no sign of steam, try this for
aminute or so:
1. Turn the air conditioning off.