2004 GMC SIERRA DENALI lights

You can be temporarily blinded by approaching
headlamps. It can take a second or two, or even several
seconds, for your eyes to re-adjust to the dark. When
you are faced with severe glare (as from a driver
who does not lower the high beams, or a vehicle with
misaimed headlamps), slow down a little. Avoid
staring directly into the approaching headlamps.
Keep your windshield and all the glass on your vehicle
clean Ð inside and out. Glare at night is made much
worse by dirt on the glass. Even the inside of the glass
can build up a ®lm caused by dust. Dirty glass makes
lights dazzle and ¯ash more than clean glass would,
making the pupils of your eyes contract repeatedly.
Remember that your headlamps light up far less of a
roadway when you are in a turn or curve. Keep
your eyes moving; that way, it is easier to pick out dimly
lighted objects. Just as your headlamps should be
checked regularly for proper aim, so should your eyes
be examined regularly. Some drivers suffer from
night blindness Ð the inability to see in dim light Ð and
are not even aware of it.Driving in Rain and on Wet Roads
Rain and wet roads can mean driving trouble. On a wet
road, you can not stop, accelerate or turn as well
because your tire-to-road traction is not as good as on
dry roads. And, if your tires do not have much tread
left, you will get even less traction. It is always wise to
go slower and be cautious if rain starts to fall while
you are driving. The surface may get wet suddenly when
your re¯exes are tuned for driving on dry pavement.
4-33

Engine Coolant
The cooling system in your vehicle is ®lled with
DEX-COOLžengine coolant. This coolant is designed
to remain in your vehicle for 5 years or 150,000 miles
(240 000 km), whichever occurs ®rst, if you add only
DEX-COOL
žextended 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, see
Engine Overheating on
page 5-25.A 50/50 mixture of clean, drinkable water and
DEX-COOL
žcoolant will:
·Give freezing protection down to-34ÉF (-37ÉC).
·Give boiling protection up to 265ÉF (129ÉC).
·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-COOLžmay
cause premature engine, heater core or radiator
corrosion. In addition, the engine coolant may
require changing sooner, at 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
ž(silicate-free) coolant in your vehicle.
5-21

U
Underhood Fuse Block...................................5-109
Understanding Radio Reception........................3-86
Uniform Tire Quality Grading............................5-71
United States................................................... 7-4
Using HomeLink
ž...........................................2-41
Using the Recovery Hooks...............................4-47
V
Vehicle
Control........................................................ 4-5
Damage Warnings........................................... iv
Loading......................................................4-48
Symbols......................................................... iv
Vehicle Data Collection and Event Data
Records....................................................... 7-9
Vehicle Identi®cation
Number (VIN)............................................5-104
Service Parts Identi®cation Label..................5-104
Vehicle Personalization
Memory Seat..............................................2-45
Vehicle Storage..............................................5-40
Visors...........................................................2-15
Voltmeter Gage..............................................3-36
W
Warning Lights, Gages and Indicators................3-27
Warnings
DIC Warnings and Messages........................3-57
Hazard Warning Flashers............................... 3-4
Other Warning Devices.................................. 3-4
Safety and Symbols......................................... iii
Vehicle Damage.............................................. iv
Washing Your Vehicle......................................5-99
Weight Distributing Hitches and Weight
Carrying Hitches..........................................4-63
Weight of the Trailer........................................4-61
Weight of Trailer Tongue..................................4-62
What Kind of Engine Oil to Use........................5-12
What to Add..................................................5-38
What to Do with Used Oil................................5-15
What to Use..................................5-22, 5-35, 5-47
Wheels
Alignment and Tire Balance..........................5-72
Replacement...............................................5-73
When to Add Engine Oil..................................5-12
When to Change Engine Oil
(GM Oil Life System)...................................5-14
When to Check..............................................5-67
When to Check and Change............................5-18
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