2007 GMC YUKON XL heater

Keys.............................................................111
Remote Keyless Entry System.....................112
Remote Keyless Entry System Operation......113
Doors and Locks.........................................120
Door Locks................................................120
Power Door Locks......................................121
Delayed Locking.........................................121
Programmable Automatic Door Locks.........121
Rear Door Security Locks..........................122
Lockout Protection......................................122
Liftgate/Liftglass..........................................123
Power Liftgate............................................125
Power Running Boards...............................129
Windows......................................................130
Power Windows.........................................131
Sun Visors.................................................132
Theft-Deterrent Systems..............................132
Content Theft-Deterrent..............................132
PASS-Key
®III+..........................................134
PASS-Key®III+ Operation..........................134
Starting and Operating Your Vehicle..........136
New Vehicle Break-In.................................136
Ignition Positions........................................137Retained Accessory Power (RAP)..............138
Starting the Engine.....................................138
Adjustable Throttle and Brake Pedal...........140
Engine Coolant Heater...............................140
Displacement on Demand™ (DoD™)..........141
Automatic Transmission Operation..............142
Tow/Haul Mode..........................................145
Four-Wheel Drive.......................................146
Parking Brake............................................151
Shifting Into Park (P)..................................152
Shifting Out of Park (P)..............................154
Parking Over Things That Burn..................154
Engine Exhaust..........................................155
Running the Engine While Parked..............156
Mirrors..........................................................157
Automatic Dimming Rearview Mirror with
OnStar
®, Compass and Temperature
Display....................................................157
Automatic Dimming Rearview Mirror with
Compass and Temperature Display.........160
Outside Manual Mirrors..............................163
Outside Trailer-Tow Mirrors........................163
Outside Power Mirrors................................164
Section 2 Features and Controls
109

Adjustable Throttle and Brake Pedal
If your vehicle has this feature, you can change
the position of the throttle and brake pedals.
The switch used to
adjust the pedals is
located on the center
console below the
climate control system.
Press the arrow at the bottom of the switch to
move the pedals closer to your body. Press
the arrow at the top of the switch to move the
pedals away from your body.
This feature is designed for shorter drivers, since
the pedals can not move farther away from
the standard position, but can move toward the
driver for better pedal reach.No adjustment to the pedals can be made when
the vehicle is in REVERSE (R) or while using
the cruise control.
Your vehicle may have a memory function which
allows pedal settings to be saved and recalled.
SeeMemory Seat, Mirrors, and Pedals on
page 13for more information.
Engine Coolant Heater
Your vehicle may have an engine coolant heater.
In very cold weather, 0°F (−18°C) or colder,
the engine coolant heater can help. You will get
easier starting and better fuel economy during
engine warm-up.
Usually, the coolant heater should be plugged in a
minimum of four hours prior to starting your vehicle.
At temperatures above 32°F (0°C), use of the
coolant heater is not required. Your vehicle may
also have an internal thermostat in the plug end of
the cord. This will prevent operation of the engine
coolant heater when the temperature is at or above
0°F (−18°C) as noted on the cord.
140

To Use the Engine Coolant Heater
1. Turn off the engine.
2. Open the hood and unwrap the electrical
cord. The cord is located on the driver’s
side of the engine compartment, near
the power steering uid reservoir.
3. Plug the cord into a normal, grounded
110-volt AC outlet.
{CAUTION:
Plugging the cord into an ungrounded
outlet could cause an electrical shock.
Also, the wrong kind of extension cord
could overheat and cause a re. You
could be seriously injured. Plug the cord
into a properly grounded three-prong
110-volt AC outlet. If the cord will not
reach, use a heavy-duty three-prong
extension cord rated for at least 15 amps.4. Before starting the engine, be sure to unplug
and store the cord as it was before to keep it
away from moving engine parts. If you do
not, it could be damaged.
How long should you keep the coolant heater
plugged in? The answer depends on the outside
temperature, the kind of oil you have, and some
other things. Instead of trying to list everything here,
we ask that you contact your dealer in the area
where you will be parking your vehicle. The dealer
can give you the best advice for that particular area.
Displacement on Demand™ (DoD™)
Your vehicle’s V8 engine may have Displacement
on Demand™ (DoD™). This system allows the
engine to operate on either all or half of its
cylinders, depending on your driving conditions.
When less power is required, such as cruising at a
constant vehicle speed, the system will operate in
the half cylinder mode, allowing your vehicle to
achieve better fuel economy. When greater power
demands are required, such as accelerating from a
stop, passing, or merging onto a freeway, the
system will maintain full-cylinder operation.
141

Outlet Adjustment
Use the air outlets located in the center and on
the side of your instrument panel to direct
the airow.
Operation Tips

Keep the hood and front air inlets free of ice,
snow, or any other obstruction (such as
leaves). The heater and defroster will work far
better, reducing the chance of fogging the
inside of your windows.
When you enter a vehicle in cold weather,
press the fan up button to the maximum
fan level before driving. This helps clear the
intake ducts of snow and moisture, and
reduces the chance of fogging the inside of
your window.
Keep the air path under the front seats clear
of objects. This helps air to circulate
throughout your vehicle.
Adding outside equipment to the front of your
vehicle, such as hood-air deectors, may affect
the performance of the heating and air
conditioning system. Check with your dealer
before adding equipment to the outside of your
vehicle.
Rear Air Conditioning and Heating
System
If your vehicle has this system, the rear controls
are three knobs located in the headliner.
The system can be controlled from the front
controls as well as the rear controls.
To turn the system on, press the AUX button on
the front climate control system, an indicator will be
lit. Pressing the AUX button the rst time will
turn the rear system on in a mimic mode. In this
mode, the airow in the rear will be approximately
the same direction, temperature, and fan speed
as the front. Pressing the AUX button again
will turn the rear system and the indicator off.
If the rear controls are adjusted, the system will
enter a rear independent mode. Airow in the rear
will then be directed according to the settings of
rear controls. The rear system can be turned off by
pressing the AUX button on the front climate
control system and the indicator will turn off.
220

Radio with CD and DVD (MP3)
If your vehicle has a Rear Seat Entertainment
(RSE) system, your vehicle will have a CD/DVD
radio. SeeRear Seat Entertainment System
on page 321for more information on the vehicle’s
RSE system.
The DVD player is positioned as the top slot of the
radio faceplate. The player is capable of reading
the “DTS” programmed DVD Audio or DVD
Video media (“DTS” and “DTS 2.0” are trademarks
of Digital Theater Systems Inc.).
Radio Data System (RDS)
The audio system has a Radio Data System
(RDS). The RDS feature is available for use only
on FM stations that broadcast RDS information.
This system relies upon receiving specic
information from these stations and will only work
when the information is available. While the
radio is tuned to an FM-RDS station, the station
name or call letters will appear on the display.
In rare cases, a radio station may broadcast
incorrect information that will cause the radio
features to work improperly. If this happens,
contact the radio station.
295

{CAUTION:
Snow can trap exhaust gases under your
vehicle. This can cause deadly CO
(carbon monoxide) gas to get inside.
CO could overcome you and kill you.
You cannot see it or smell it, so you might
not know it is in your vehicle. Clear away
snow from around the base of your
vehicle, especially any that is blocking
your exhaust pipe. And check around
again from time to time to be sure snow
does not collect there.
Open a window just a little on the side of
the vehicle that is away from the wind.
This will help keep CO out.Run your engine only as long as you must. This
saves fuel. When you run the engine, make it go a
little faster than just idle. That is, push the
accelerator slightly. This uses less fuel for the
heat that you get and it keeps the battery charged.
You will need a well-charged battery to restart
the vehicle, and possibly for signaling later on with
your headlamps. Let the heater run for a while.
Then, shut the engine off and close the window
almost all the way to preserve the heat. Start
the engine again and repeat this only when you
feel really uncomfortable from the cold. But do it as
little as possible. Preserve the fuel as long as
you can. To help keep warm, you can get out of
the vehicle and do some fairly vigorous exercises
every half hour or so until help comes.
387

Those stations that do have E85 should have a
label indicating ethanol content. Do not use the fuel
if the ethanol content isgreaterthan 85%.
At a minimum, E85 should meet ASTM
Specication D 5798.
To ensure quick starts in the wintertime, the
E85 fuel must be formulated properly for your
climate according to ASTM specication D 5798.
If you have trouble starting on E85, it may be
because your E85 fuel is not properly formulated
for your climate. If this happens, switching to
gasoline or adding gasoline to your fuel tank may
improve starting. For good starting and heater
efficiency below 32°F (0°C), 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 ve gallons
(18.9 L) when refueling. You should drive the
vehicle immediately after refueling for at least
ve miles (8 km).
E85 has less energy per gallon than gasoline, so
you will need to rell your fuel tank more often
when using E85 than when you are using gasoline.
Regular unleaded gasoline is recommendedwhen pulling a trailer. For payload capacity with
ethanol fuel, seeLoading Your Vehicle on
page 390.
Notice:Some additives are not compatible
with E85 fuel and may harm your fuel system.
Damage caused by additives would not be
covered by your new vehicle warranty. Do not
use additives with E85 fuel.
Notice:Your vehicle was not designed for
fuel that contains methanol. Do not use
fuel containing methanol. It can corrode metal
parts in your fuel system and also damage
the plastic and rubber parts. That damage
would not be covered under your warranty.
Fuels in Foreign Countries
If you plan on driving in another country outside the
United States or Canada, the proper fuel may be
hard to nd. 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 your 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.
431

Engine Coolant
The cooling system in your vehicle is lled with
DEX-COOL®engine coolant. This coolant is
designed to remain in your vehicle for ve years or
150,000 miles (240 000 km), whichever occurs
rst, if you add only DEX-COOL
®extended
life coolant.
The following explains your cooling system and
how to add coolant when it is low. If you have
a problem with engine overheating, seeEngine
Overheating on page 452.A 50/50 mixture of clean, drinkable water and
DEX-COOL
®coolant will:
Give freezing protection down to
−34°F (−37°C).
Give boiling protection up to 265°F (129°C).
Protect against rust and corrosion.
Help keep the proper engine temperature.
Let the warning lights and gages work as they
should.
Notice:Using coolant other than DEX-COOL
®
may cause premature engine, heater core,
or radiator corrosion. In addition, the engine
coolant may require changing sooner, at
the rst maintenance service after each
30,000 miles (50 000 km) or 24 months,
whichever occurs rst. Any repairs would not
be covered by your warranty. Always use
DEX-COOL
®(silicate-free) coolant in your
vehicle.
449