2003 GMC YUKON DENALI length

2. Set the driver’s and passenger’s temperature.
To find your comfort setting, start with a
74°F (23°C)
temperature setting and allow about
20 minutes
for the system to regulate. Turn the driver’s or
passenger’s side temperature knob
to adjust the
temperature setting as necessary.
If you choose the temperature setting of 60°F
(15°C) the system will remain at the maximum
cooling setting.
If you choose the temperature
setting of
90°F (32°C) the system will remain at the
maximum heat setting. Choosing either maximum
setting will not cause the vehicle to heat or cool
any faster.
Be careful not to cover the sensor located on the
top of the instrument panel near the windshield. This
sensor regulates air temperature based on sun
load, and also turns on your headlamps.
To avoid blowing cold air in cold weather, the
system will delay turning on the fan until warm air is
available. The length of delay depends on the
engine coolant temperature. Pressing the fan switch
will override this delay and change the fan to a
selected speed.
Manual Operation
You may manually adjust the air delivery mode or
fan speed.
0 (Off): Press this button to turn off the entire climate
control system. Outside air will still enter the vehicle, and
will be directed
to the floor. This direction can be changed
by pressing the mode button. The temperature can also
be adjusted using either temperature knob. Press the up
or down arrows on the fan switch, the defrost button, the
AUTO button, or the air conditioning button to turn the
system on when it is
off.
v (Fan): The switch with the fan symbol allows
you
to manually adjust the fan speed. Press the up
arrow
to increase fan speed and the down arrow
to decrease fan speed.
Pressing this button when the system
is off will turn the
system on.
% *d (Mode): Press this button to manually change the
direction of the airflow in your vehicle; keep pressing the
button until the desired mode appears on the display.
If you press the mode button to select an air delivery
mode, the display will change to show you the selected
air mode delivery. The display will then show the
current status of the system. When the system is turned
off, the display will go blank after displaying the
current status of the system.
3-21

Many adults - by some estimates, nearly half the adult
population
- choose never to drink alcohol, so they
never drive after drinking. For persons under 21,
it’s against the law in every
U.S. state to drink alcohol.
There are good medical, psychological anci
developmental reasons for these laws.
The obvious way
to eliminate the leading highway
safety problem is for people never
to drink alcohol and
then drive. But what
if people do? How much is “too
much” if someone plans to drive? It’s a lot less
than many might think. Although it depends on each
person and situation, here is some general information
on the problem.
The Blood Alcohol Concentration (BAC)
of someone
who is drinking depends upon four things:
0 The amount of alcohol consumed
The drinker’s body weight
The amount of food that is consumed before and
during drinking
consume the alcohol.
The length of time it has taken the drinker to
According to the American Medical Association, a 180 Ib
(82 kg) person who drinks three 12 ounce (355 ml)
bottles
of beer in an hour will end up with a BAC of
about
0.06 percent. The person would reach the
same BAC by drinking three 4 ounce
(120 ml) glasses
of wine or three mixed drinks if each had 1 - 1/2 ounces
(45
ml) of a liquor like whiskey, gin or vodka.
111 .... ~ .. ... ..
It’s the amount of alcohol that counts. For example, if
the same person drank three double martinis (3 ounces
or
90 ml of liquor each) within an hour, the person’s
BAC would be close
to 0.1 2 percent. A person
who consumes food just before or during drinking will
have a somewhat lower BAC level.
4-3

Q: Am I likely to stall when going downhill?
A: It’s much more likely to happen going uphill. But if it
happens going downhill, here’s what
to do.
Stop your vehicle by applying the regular brakes.
Apply the parking brake.
Shift to PARK (P) and, while still braking, restart the
Shift back to a low gear, release the parking brake,
If the engine won’t start, get out and get help.
engine.
and
drive straight down.
Driving Across an Incline
Sooner or later, an off-road trail will probably go across
the incline
of a hill. If this happens, you have to
decide whether
to try to drive across the incline. Here
are some things
to consider:
A hill that can be driven straight up or down may be
too steep to drive across. When you go straight up
or down a
hill, the length of the wheel base (the
distance from the front wheels
to the rear wheels)
reduces the likelihood the vehicle will tumble end
over end. But when you drive across an incline,
the much more narrow track width (the distance
between the left and right wheels) may not prevent
the vehicle from tilting and rolling over.
Also,
driving across an incline puts more weight on the
downhill wheels. This could cause a downhill
slide or a rollover.
Surface conditions can be a problem when you
drive across a hill.
Loose gravel, muddy spots,
or even wet grass can cause your tires
to slip
sideways, downhill.
If the vehicle slips sideways,
it can hit something that will trip
it (a rock, a rut, etc.)
and roll over.
Hidden obstacles can make the steepness of the
incline even worse. If you drive across a rock
with the uphill wheels, or
if the downhill wheels
drop into a rut or depression, your vehicle can tilt
even more.
For reasons like these, you need to decide carefully
whether to try to drive across an incline. Just because
the trail goes across the incline doesn’t mean you
have to drive it. The last vehicle to try it might have
rolled over.
4-24

Windshield Wiper Blade Replacement
Windshield wiper blades should be inspected at least
twice a year for wear and cracking. See Wiper
Blade Check under
At Least Twice a Year on page 6-10
for more information.
Replacement blades come in different types and are removed in different ways. For proper type and length,
see Normal Maintenance Replacement
Parts on
page 5-98. Here’s how to remove the shephard’s
hook type.
To replace the windshield wiper blade assembly do the
following:
1. Lift the wiper arm and turn the blade until it is
facing away from the windshield.
2. Push the release lever and slide the wiper assembly
3. Install a new blade by reversing Steps 1 and 2.
toward the driver’s side of the vehicle.
5-54

Normal Maintenance Replacement Parts
Replacement part numbers listed in this section are based on the latest information available at the time of printing,
and are subject
to change. If a part listed in this manual is not the same as the part used in your vehicle when it was
built, or
if you have any questions, please contact your GM dealer.
These specifications are for information only.
If you have any questions, see the service manual.
I Part 1 Number I
Oil Filter
G F626"
Fuel Filter 41
-974*
/ PZTR5A15t
Spark Plugs cv2001
-c* PCV Valve" AI
51 8C*
Engine Air CleanedFilter P F44*
Wiper Blades (Front)
ITTA
Wiper Blade Tvpe (Front)
151 53642**
Wiper Blade Length (Front)
ITTA WiDer Blade Tvpe (Rear) 221
54396**
Wiper Blades (Rear) 22.0
inches (56.0 cm) a. I
Wiper Blade Length (Rear) 18.0 inches (45.0 cm)
*ACDelco@ Part
No.
**GM Part No.
tNGK
5-98