2010 GMC YUKON DENALI heater

At a minimum, E85 should meet ASTM Specification
D 5798. By definition, this means that fuel labeled E85
will have an ethanol content between 70% and 85%.
Filling the fuel tank with fuel mixtures that do not meet
ASTM specifications can affect driveability and could
cause the malfunction indicator lamp to come on.
To ensure quick starts in the wintertime, the E85 fuel
must be formulated properly for your climate according
to ASTM specification D 5798. If you have trouble
starting on E85, it could be because the E85 fuel is not
properly formulated for your climate. If this happens,
switching to gasoline or adding gasoline to the fuel tank
can improve starting. For good starting and heater
efficiency below 0°C (32°F), the fuel mix in the fuel tank
should contain no more than 70% ethanol. It is best
not to alternate repeatedly between gasoline and E85.
If you do switch fuels, it is recommended that you
add as much fuel as possible—do not add less than
11 L (three gallons) when refueling. You should drive
the vehicle immediately after refueling for at least
11 km (seven miles) to allow the vehicle to adapt to
the change in ethanol concentration.
E85 has less energy per gallon than gasoline, so you
will need to refill the fuel tank more often when using
E85 than when you are using gasoline. See Filling the
Tank on page 6‑9. Notice:
Some additives are not compatible with E85
fuel and can harm the vehicle's fuel system. Do not
add anything to E85. Damage caused by additives
would not be covered by the vehicle warranty.
Notice: This vehicle was not designed for fuel that
contains methanol. Do not use fuel containing
methanol. It can corrode metal parts in the fuel
system and also damage plastic and rubber parts.
That damage would not be covered under the
vehicle warranty.
Fuels in Foreign Countries
If you plan on driving in another country outside the
United States or Canada, the proper fuel might be hard
to find. Never use leaded gasoline or any other fuel not
recommended in the previous text on fuel. Costly
repairs caused by use of improper fuel would not be
covered by the vehicle warranty.
To check the fuel availability, ask an auto club,
or contact a major oil company that does business in
the country where you will be driving.
6-8

Cooling System
The cooling system allows the engine to maintain the
correct working temperature.
A. Coolant Surge Tank
B. Coolant Surge Tank Pressure Cap
C. Engine Cooling Fan(s)
{WARNING:
An electric engine cooling fan under the hood can
start up even when the engine is not running and
can cause injury. Keep hands, clothing, and tools
away from any underhood electric fan.
{WARNING:
Heater and radiator hoses, and other engine
parts, can be very hot. Do not touch them. If you
do, you can be burned. (Continued)
6-26

WARNING: (Continued)
Do not run the engine if there is a leak. If you run
the engine, it could lose all coolant. That could
cause an engine fire, and you could be burned.
Get any leak fixed before you drive the vehicle.
Notice: Using coolant other than DEX-COOL
®can
cause premature engine, heater core, or radiator
corrosion. In addition, the engine coolant could
require changing sooner, at 50 000 km (30,000 miles)
or 24 months, whichever occurs first. Any repairs
would not be covered by the vehicle warranty.
Always use DEX-COOL
®(silicate-free) coolant in the
vehicle.
Engine Coolant
The cooling system in the vehicle is filled with
DEX-COOL®engine coolant. This coolant is designed
to remain in the vehicle for five years or 150,000 miles
(240 000 km), whichever occurs first.
The following explains the cooling system and how to
check and add coolant when it is low. If there is a
problem with engine overheating, see Engine
Overheating on page 6‑32.
6-27

What to Use
{WARNING:
Adding only plain water to the cooling system
can be dangerous. Plain water, or some other
liquid such as alcohol, can boil before the proper
coolant mixture will. The vehicle's coolant
warning system is set for the proper coolant
mixture. With plain water or the wrong mixture,
the engine could get too hot but you would not
get the overheat warning. The engine could catch
fire and you or others could be burned. Use a
50/50 mixture of clean, drinkable water and
DEX-COOL
®coolant.Use a 50/50 mixture of clean, drinkable water and
DEX-COOL
®coolant. If using this mixture, nothing else
needs to be added. This mixture:
.Gives freezing protection down to −34°F (−37°C),
outside temperature.
.Gives boiling protection up to 265°F (129°C),
engine temperature.
.Protects against rust and corrosion.
.Will not damage aluminum parts.
.Helps keep the proper engine temperature.
Notice: If an improper coolant mixture is used,
the engine could overheat and be badly damaged.
The repair cost would not be covered by the vehicle
warranty. Too much water in the mixture can freeze
and crack the engine, radiator, heater core, and
other parts.
Notice: If extra inhibitors and/or additives are used
in the vehicle's cooling system, the vehicle could be
damaged. Use only the proper mixture of the engine
coolant listed in this manual for the cooling system.
See Recommended Fluids and Lubricants
on
page 7‑11for more information.
6-28

If No Steam Is Coming From The
Engine 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 an engine overheat warning 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. SeeTowing a Trailer on page 5‑42. 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 gage is no longer in the
overheat zone or an overheat warning no longer
displays, the vehicle can be driven. Continue to drive
the vehicle slow for about 10 minutes. Keep a safe
vehicle distance from the car in front of you. 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.
6-34

Driver Information Center (DIC) . . . . . . . . . . . . . . . . . . . . 4-42DIC Operation and Displays . . . . . . . . . . . . . . . . 4-43, 4-50
DIC Vehicle Customization . . . . . . . . . . . . . . . . . . . . . . . 4-66
DIC Warnings and Messages . . . . . . . . . . . . . . . . . . . . . 4-56
Driving At Night . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-24
Before a Long Trip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-25
Defensive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
Drunk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
Highway Hypnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-26
Hill and Mountain Roads . . . . . . . . . . . . . . . . . . . . . . . . . . 5-26
In Rain and on Wet Roads . . . . . . . . . . . . . . . . . . . . . . . . 5-24
Loss of Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-11
Off-Road . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-12
Off-Road Recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-10
Recovery Hooks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-30
Rocking Your Vehicle to Get it Out . . . . . . . . . . . . . . . . 5-30
Winter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-27
Driving for Better Fuel Economy . . . . . . . . . . . . . . . . . . . 1-24
Dual Automatic Climate Control System . . . . . . . . . . . 4-18
DVD Rear Seat Entertainment System . . . . . . . . . . . . . . . .4-120E
E85 Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-7
EDR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-18
Electrical Equipment, Add-On . . . . . . . . . . . . . . . . . . . . 6-106
Electrical SystemCenter Instrument Panel Fuse Block . . . . . . . . . . . . . 6-110
Fuses and Circuit Breakers . . . . . . . . . . . . . . . . . . . . . .6-107
Instrument Panel Fuse Block . . . . . . . . . . . . . . . . . . . .6-108
Power Windows and Other Power Options . . . . . .6-107
Underhood Fuse Block . . . . . . . . . . . . . . . . . . . . . . . . . . 6-111
Windshield Wiper Fuses . . . . . . . . . . . . . . . . . . . . . . . . .6-107
Electronic Immobilizer PASS-Key
®III+ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-22
Electronic Immobilizer Operation PASS-Key
®III+ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-22
Engine
Air Cleaner/Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-20
Check and Service Engine Soon Lamp . . . . . . . . . . . 4-35
Compartment Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-14
Coolant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-27
Coolant Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-28
Coolant Temperature Gage . . . . . . . . . . . . . . . . . . . . . . . 4-34
i - 5

Fuel EconomyDriving for Better . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-24
Fuses Center Instrument Panel Fuse Block . . . . . . . . . . . . . 6-110
Fuses and Circuit Breakers . . . . . . . . . . . . . . . . . . . . . .6-107
Instrument Panel Fuse Block . . . . . . . . . . . . . . . . . . . .6-108
Underhood Fuse Block . . . . . . . . . . . . . . . . . . . . . . . . . . 6-111
Windshield Wiper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-107
G
GagesEngine Coolant Temperature . . . . . . . . . . . . . . . . . . . . . 4-34
Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-41
Oil Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-38
Speedometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-27
Tachometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-27
Trip Odometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-27
Voltmeter Gage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-31
Garage Door Opener . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-55
Gasoline Octane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6
Glove Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-62
GM Mobility Reimbursement Program . . . . . . . . . . . . . . .8-7
H
Halogen Bulbs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-53
Hazard Warning Flashers . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-3
Head Restraints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2
Headlamps
Aiming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-50
Bulb Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-52
Daytime Running Lamps (DRL) . . . . . . . . . . . . . . . . . . . 4-12
Exterior Lamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11
Flash-to-Pass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
High/Low Beam Changer . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
On Reminder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12
Heated Steering Wheel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Heated Seats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-5
Heater Engine Coolant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-28
High-Speed Operation, Tires . . . . . . . . . . . . . . . . . . . . . . 6-66
Highbeam On Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-40
Highway Hypnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-26
Hill and Mountain Roads . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-26
Hood Checking Things Under . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-12
Release . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-12
Horn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-3
How to Wear Safety Belts Properly . . . . . . . . . . . . . . . . 2-31
i - 7