2005 CHEVROLET AVALANCHE coolant temperature

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 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.
What to Use
Use a mixture of one-half clean, drinkable water and
one-half DEX-COOL®coolant which will not damage
aluminum parts. If you use this coolant mixture, you do
not need to add anything else.
{CAUTION:
Adding only plain water to your cooling
system can be dangerous. Plain water, or
some other liquid such as alcohol, can boil
before the proper coolant mixture will. Your
vehicle’s coolant warning system is set for the
proper coolant mixture. With plain water or the
wrong mixture, your engine could get too hot
but you would not get the overheat warning.
Your engine could catch re and you or others
could be burned. Use a 50/50 mixture of clean,
drinkable water and DEX-COOL
®coolant.
Notice:If you use an improper coolant mixture,
your engine could overheat and be badly damaged.
The repair cost would not be covered by your
warranty. Too much water in the mixture can freeze
and crack the engine, radiator, heater core and
other parts.
If you have to add coolant more than four times a year,
have your dealer check your cooling system.
Notice:If you use the proper coolant, you do not
have to add extra inhibitors or additives which claim
to improve the system. These can be harmful.
5-26

Coolant Surge Tank Pressure Cap
Notice:If the pressure cap is not tightly installed,
coolant loss and possible engine damage may
occur. Be sure the cap is properly and tightly
secured.
The coolant surge tank pressure cap must be fully
installed on the coolant surge tank. SeeEngine
Compartment Overview on page 5-12for more
information on location.
Engine Overheating
You will nd a coolant temperature gage on your
vehicle’s instrument panel. SeeEngine Coolant
Temperature Gage on page 3-38.
In addition, you will nd an ENGINE COOLANT HOT,
ENGINE OVERHEATED and a REDUCED ENGINE
POWER message in the Driver Information Center (DIC)
on the instrument panel. SeeDIC Warnings and
Messages on page 3-49.
If Steam Is Coming From Your Engine
{CAUTION:
Steam from an overheated engine can burn
you badly, even if you just open the hood. Stay
away from the engine if you see or hear steam
coming from it. Just turn it off and get
everyone away from the vehicle until it cools
down. Wait until there is no sign of steam or
coolant before you open the hood.
If you keep driving when your engine is
overheated, the liquids in it can catch re. You
or others could be badly burned. Stop your
engine if it overheats, and get out of the
vehicle until the engine is cool.
SeeOverheated Engine Protection Operating
Mode on page 5-30for information on driving
to a safe place in an emergency.
5-28

When the engine is cold,
the coolant level should be
at or above the FULL
COLD mark. If it is not, you
may have a leak at the
pressure cap or in
the radiator hoses, heater
hoses, radiator, water
pump or somewhere else
in the cooling system.
{CAUTION:
Heater and radiator hoses, and other engine
parts, can be very hot. Do not touch them.
If you do, you can be burned.
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 re, and you could be
burned. Get any leak xed before you drive the
vehicle.Notice:Engine damage from running your engine
without coolant is not covered by your warranty. See
Overheated Engine Protection Operating Mode on
page 5-30for information on driving to a safe place
in an emergency.
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 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.
If your vehicle is equipped with an electric engine
cooling fan, check the coolant temperature gage. If the
coolant temperature is approximately 232°F (111°C),
the electric cooling fan should be running. If it is
not, your vehicle needs service. Turn off the engine.
If your vehicle is equipped with an engine-driven cooling
fan, start the engine again and see if the fan speed
increases when idle speed is doubled by pushing the
accelerator pedal down. If it does not, your vehicle
needs service. Turn off the engine.
5-32

4. With the coolant surge tank pressure cap off, start
the engine and let it run until you can feel the upper
radiator hose getting hot. Watch out for the
engine cooling fan.
By this time, the coolant level inside the coolant
surge tank may be lower. If the level is lower, add
more of the proper mixture to the coolant surge tank
until the level reaches the FULL COLD mark.
5. Then replace the pressure cap. Be sure the
pressure cap is hand-tight and fully seated.
Engine Fan Noise
If your vehicle is equipped with 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 more fully engages, so you
may hear an increase in fan noise. This is normal and
should not be mistaken as the transmission slipping or
making extra shifts. It is merely the cooling system
functioning properly. The fan will slow down when
additional cooling is not required and the clutch
disengages.
You may also hear this fan noise when you start the
engine. It will go away as the fan clutch partially
disengages.
If your vehicle is equipped with electric cooling fans, you
may hear the fans spinning at low speed during most
everyday driving. The fans may turn off if no cooling is
required. Under heavy vehicle loading, trailer towing,
and/or high outside temperatures, or if you are operating
your air conditioning system, the fans change to high
speed and you may hear an increase in fan noise. This
is normal and indicates that the cooling system is
functioning properly. The fans will change to low speed
when additional cooling is no longer required.
5-35

(b)Visually inspect front and rear suspension and
steering system for damaged, loose, or missing parts,
signs of wear or lack of lubrication. Inspect power
steering lines and hoses for proper hook-up, binding,
leaks, cracks, chang, etc. Visually check constant
velocity joints, rubber boots, and axle seals for leaks.
(c)Visually inspect hoses and have them replaced
if they are cracked, swollen, or deteriorated. Inspect all
pipes, ttings, and clamps; replace with genuine GM
parts as needed. To help ensure proper operation,
a pressure test of the cooling system and pressure cap
and cleaning the outside of the radiator and air
conditioning condenser is recommended at least once a
year.
(d)Visually inspect wiper blades for wear or cracking.
Replace wiper blades that appear worn or damaged
or that streak or miss areas of the windshield.
(e)Make sure the safety belt reminder light and all your
belts, buckles, latch plates, retractors, and anchorages
are working properly. Look for any other loose or
damaged safety belt system parts. If you see anything
that might keep a safety belt system from doing its
job, have it repaired. Have any torn or frayed safety belts
replaced. Also look for any opened or broken airbag
coverings, and have them repaired or replaced.
The airbag system does not need regular maintenance.(f)Lubricate all key lock cylinders, hood latch assembly,
secondary latch, pivots, spring anchor, release pawl,
midgate hinges, side storage box door hinges, tailgate
hinges, tailgate linkage, outer tailgate handle pivot
points, latch bolt, fuel door hinge, locks, and folding seat
hardware. More frequent lubrication may be required
when exposed to a corrosive environment. Applying
silicone grease on weatherstrips with a clean cloth will
make them last longer, seal better, and not stick or
squeak.
(g)Check vent hose at transfer case for kinks and
proper installation.
(h)Change automatic transmission uid and lter if the
vehicle is mainly driven under one or more of these
conditions:
In heavy city traffic where the outside temperature
regularly reaches 90°F (32°C) or higher.
In hilly or mountainous terrain.
When doing frequent trailer towing.
Uses such as found in taxi, police, or delivery
service.
(i)Drain, ush, and rell cooling system. This service
can be complex; you should have your dealer perform
this service. See Engine Coolant on page 5-25 for
what to use. Inspect hoses. Clean radiator, condenser,
pressure cap, and ller neck. Pressure test the
cooling system and pressure cap.
6-8

Center Front Passenger Position, Safety Belts....1-22
Center Overhead Console................................2-57
Chains, Tire...................................................5-74
Charging System Light....................................3-34
Check
Engine Light...............................................3-40
Checking Things Under the Hood......................5-10
Chemical Paint Spotting.................................5-101
Child Restraints
Child Restraint Systems...............................1-35
Infants and Young Children...........................1-31
Lower Anchorages and Top Tethers for
Children (LATCH System)..........................1-42
Older Children.............................................1-29
Securing a Child Restraint Designed
for the LATCH System..............................1-44
Securing a Child Restraint in a Rear
Seat Position...........................................1-44
Securing a Child Restraint in the Center
Front Seat Position...................................1-46
Securing a Child Restraint in the Right
Front Seat Position...................................1-46
Top Strap...................................................1-40
Top Strap Anchor Location............................1-41
Where to Put the Restraint...........................1-38
Chime Level Adjustment.................................3-104
Cigarette Lighter.............................................3-20Cleaning
Aluminum or Chrome-Plated Wheels.............5-100
Exterior Lamps/Lenses.................................5-98
Fabric/Carpet..............................................5-96
Finish Care.................................................5-98
Inside of Your Vehicle..................................5-95
Instrument Panel, Vinyl, and Other Plastic
Surfaces.................................................5-97
Leather......................................................5-97
Tires........................................................5-100
Underbody Maintenance.............................5-101
Washing Your Vehicle...................................5-98
Weatherstrips..............................................5-98
Windshield and Wiper Blades........................5-99
Climate Control System
Dual..........................................................3-20
Dual Automatic............................................3-23
Outlet Adjustment........................................3-28
Comfort Guides, Rear Safety Belt.....................1-26
Content Theft-Deterrent....................................2-24
Control of a Vehicle.......................................... 4-5
Coolant
Engine Temperature Gage............................3-38
Heater, Engine............................................2-30
Surge Tank Pressure Cap.............................5-28
Cooling System..............................................5-30
Cruise Control................................................3-10
3

E
Electrical System...........................................5-103
Center Instrument Panel Fuse Block.............5-106
Fuses and Circuit Breakers.........................5-104
Instrument Panel Fuse Block.......................5-104
Power Windows and Other Power Options....5-104
Underhood Fuse Block...............................5-107
Windshield Wiper Fuses.............................5-104
Engine
Air Cleaner/Filter.........................................5-20
Battery.......................................................5-41
Check and Service Engine Soon Light............3-40
Coolant......................................................5-25
Coolant Heater............................................2-30
Coolant Temperature Gage...........................3-38
Engine Compartment Overview......................5-12
Exhaust.....................................................2-42
Fan Noise..................................................5-35
Oil .............................................................5-15
Oil Life System...........................................5-18
Overheated Protection Operating Mode...........5-30
Overheating................................................5-28
Starting......................................................2-28
Entry/Exit Lighting...........................................3-18
Event Data Recorders (EDR)............................. 7-9
Extender, Safety Belt.......................................1-28
Exterior Cargo Lamps......................................3-17
Exterior Lamps...............................................3-14
F
Filter
Engine Air Cleaner......................................5-20
Finish Damage.............................................5-101
Fixed Mast Antenna.......................................3-104
Flash-to-Pass................................................... 3-9
Flat Tire........................................................5-74
Flat Tire, Changing.........................................5-75
Flat Tire, Storing.............................................5-91
Fluid
Automatic Transmission................................5-22
Power Steering...........................................5-36
Windshield Washer......................................5-36
Fog Lamps....................................................3-16
Four-Wheel Drive....................................2-34, 5-48
Front Armrest Storage Area..............................2-57
Front Axle......................................................5-49
Fuel............................................................... 5-5
Additives...................................................... 5-6
California Fuel.............................................. 5-5
E-85 (85% Ethanol)....................................... 5-6
Filling a Portable Fuel Container..................... 5-9
Filling Your Tank........................................... 5-8
Fuels in Foreign Countries.............................. 5-7
Gage.........................................................3-44
Gasoline Octane........................................... 5-5
Gasoline Specications.................................. 5-5
Low Warning Light.......................................3-45
5

Fuses
Center Instrument Panel Fuse Block.............5-106
Fuses and Circuit Breakers.........................5-104
Instrument Panel Fuse Block.......................5-104
Underhood Fuse Block...............................5-107
Windshield Wiper.......................................5-104
G
Gage
Engine Coolant Temperature.........................3-38
Fuel..........................................................3-44
Oil Pressure...............................................3-42
Speedometer..............................................3-31
Tachometer.................................................3-31
Transmission Temperature.............................3-38
Voltmeter Gage...........................................3-35
Garage Door Opener.......................................2-53
Gasoline
Octane........................................................ 5-5
Specications............................................... 5-5
Glove Box.....................................................2-57
GM Mobility Reimbursement Program.................. 7-5
H
Hazard Warning Flashers................................... 3-6
Head Restraints............................................... 1-7
Headlamps....................................................5-50
Automatic Headlamp System.........................3-15
Bulb Replacement.......................................5-50
Daytime Running Lamps.......................3-15, 5-56
Flash-to-Pass............................................... 3-9
Front Turn Signal, Sidemarker and
Daytime Running Lamps...........................5-54
Front Turn Signal, Sidemarker and
Parking Lamps.........................................5-53
Halogen Bulbs............................................5-50
High/Low Beam Changer................................ 3-8
On Reminder..............................................3-15
Heated Seats................................................... 1-4
Heater...........................................................3-20
Heater...........................................................3-23
Highbeam On Light.........................................3-44
Highway Hypnosis...........................................4-38
Hill and Mountain Roads..................................4-39
HomeLink
®Wireless Control System.................2-53
HomeLink®Wireless Control
System Operation........................................2-54
6