Black plate (23,1)
GMC Yukon/Yukon XL Owner Manual - 2012
Vehicle Care
10-23
.
Idles for long periods in traffic.
.
Tows a trailer. See
Trailer
Towing on page 9
‑
72
.
If the overheat warning is displayed
with no sign of steam:
1. Turn the air conditioning off.
2. Turn the heater on to the highest
temperature and to the highest
fan speed. Open the windows as
necessary.
3. In heavy traffic, let the engine
idle in N (Neutral) while stopped.
If it is safe to do so, pull off the
road, shift to P (Park) or
N (Neutral) and let the
engine idle.
If the temperature overheat gauge
is no longer in the overheat zone
or an overheat warning no longer
displays, the vehicle can be driven.
Continue to drive the vehicle slowly
for about 10 minutes. Keep a safe
vehicle distance from the vehicle in
front. If the warning does not come
back on, continue to drive normally.
If the warning continues, pull
over, stop, and park the vehicle
right away.
If there is no sign of steam, idle
the engine for three minutes
while parked. If the warning is still
displayed, turn off the engine until it
cools down. Also, see
“
Overheated
Engine Protection Operating Mode
”
later in this section.
Overheated Engine
Protection
Operating Mode
If an overheated engine condition
exists and the ENGINE POWER IS
REDUCED message is displayed,
an overheat protection mode which
alternates firing groups of cylinders
helps prevent engine damage. In
this mode, a loss in power and
engine performance will be noticed.
This operating mode allows the
vehicle to be driven to a safe place
in an emergency. Driving extended
distances and/or towing a trailer in
the overheat protection mode
should be avoided.
Notice:
After driving in the
overheated engine protection
operating mode, to avoid engine
damage, allow the engine to cool
before attempting any repair.
The engine oil will be severely
degraded. Repair the cause of
coolant loss, change the oil and
reset the oil life system. See
Engine Oil on page 10
‑
8
.
Engine Fan
If the vehicle has a clutched engine
cooling fan, when the clutch is
engaged, the fan spins faster to
provide more air to cool the engine.
In most everyday driving conditions,
the fan is spinning slower and the
clutch is not fully engaged.
This improves fuel economy and
reduces fan noise. Under heavy
vehicle loading, trailer towing, and/
or high outside temperatures, the
fan speed increases as the clutch
Содержание 2012 GMC Yukon/Yukon XL
Страница 6: ...Black plate 6 1 GMC Yukon Yukon XL Owner Manual 2012 vi Introduction 2 NOTES...
Страница 34: ...Black plate 28 1 GMC Yukon Yukon XL Owner Manual 2012 1 28 In Brief 2 NOTES...
Страница 58: ...Black plate 24 1 GMC Yukon Yukon XL Owner Manual 2012 2 24 Keys Doors and Windows 2 NOTES...
Страница 266: ...Black plate 14 1 GMC Yukon Yukon XL Owner Manual 2012 8 14 Climate Controls 2 NOTES...
Страница 398: ...Black plate 42 1 GMC Yukon Yukon XL Owner Manual 2012 10 42 Vehicle Care...
Страница 465: ...Black plate 5 1 GMC Yukon Yukon XL Owner Manual 2012 Service and Maintenance 11 5...
Страница 467: ...Black plate 7 1 GMC Yukon Yukon XL Owner Manual 2012 Service and Maintenance 11 7...