2003 CHEVROLET TRAIL BLAZER coolant level

6. Start the engine and let it run until you can feel the
upper radiator hose getting hot. Watch out for the
engine cooling fan.
7. By this time, the coolant level inside the radiator
®ller neck may be lower. If the level is lower, add
more of the proper DEX-COOL
žcoolant mixture
through the ®ller neck until the level reaches
the base of the ®ller neck.
8. Then replace the pressure cap. At any time during
this procedure if coolant begins to ¯ow out of the
®ller neck, reinstall the pressure cap. Be sure
the pressure cap is hand-tight.
Engine Fan Noise
This vehicle has 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 clutch is not engaged. This improves fuel
economy and reduces fan noise. Under heavy vehicle
loading, trailer towing, and/or high outside temperatures,
the fan speed increases when the clutch 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 disengages.
5-35

97,500 Miles (162 500 km)
qCheck rear/front axle ¯uid level and add ¯uid as
needed. Check constant velocity joints and axle
seals for leaking.
qRotate tires. See
Tire Inspection and Rotation on
page 5-55for proper rotation pattern and additional
information.(See footnote +.)
100,000 Miles (166 000 km)
qV8 Engine Only: Inspect spark plug wires.An Emission Control Service.
qReplace spark plugs.An Emission Control Service.
qChange automatic transmission ¯uid and ®lter if
the vehicle is mainly driven under one or more
of these conditions:
þ In heavy city traffic where the outside
temperature regularly reaches 90ÉF (32ÉC) or
higher.
þ In hilly or mountainous terrain.
þ When doing frequent trailer towing.
þ Uses such as found in taxi, police or delivery
service.qIf you haven't used your vehicle under severe service
conditions listed previously and, therefore, haven't
changed your automatic transmission ¯uid, change
both the ¯uid and ®lter
qAutomatic Transfer Case Only: Change transfer
case ¯uid.
qV8 Engine Only: Inspect Positive Crankcase
Ventilation (PCV) valve.
An Emission Control Service.
150,000 Miles (240 000 km)
qDrain, ¯ush and re®ll cooling system (or every
60 months since last service, whichever occurs ®rst).
See
Engine Coolant on page 5-24for what to use.
Inspect hoses. Clean radiator, condenser, pressure
cap and neck. Pressure test the cooling system
and pressure cap.
An Emission Control Service.
qInspect engine accessory drive belt.An Emission
Control Service.
6-10

Part B: Owner Checks and Services
Listed in this part are owner checks and services
which should be performed at the intervals speci®ed to
help ensure the safety, dependability and emission
control performance of your vehicle.
Be sure any necessary repairs are completed at once.
Whenever any ¯uids or lubricants are added to your
vehicle, make sure they are the proper ones, as shown
in Part D.
At Each Fuel Fill
It is important for you or a service station attendant to
perform these underhood checks at each fuel ®ll.
Engine Oil Level Check
Check the engine oil level and add the proper oil if
necessary. SeeEngine Oil on page 5-16for further
details.
Engine Coolant Level Check
Check the engine coolant level and add DEX-COOLž
coolant mixture if necessary. SeeEngine Coolant
on page 5-24for further details.
Windshield Washer Fluid Level Check
Check the windshield washer ¯uid level in the windshield
washer tank and add the proper ¯uid if necessary.
See
Windshield Washer Fluid on page 5-37for further
details.
At Least Once a Month
Tire In¯ation Check
Visually inspect your tires and make sure tires are
in¯ated to the correct pressures. Don't forget to check
your spare tire. See
Tires on page 5-54for further
details.
Cassette Tape Player Service
Clean cassette tape player. Cleaning should be done
every 50 hours of tape play. SeeAudio System(s)
on page 3-64for further details.
6-11

Checking Brake Fluid......................................5-39
Checking Coolant............................................5-25
Checking Engine Oil........................................5-16
Checking Things Under the Hood......................5-10
Checking Your Restraint Systems......................1-59
Chemical Paint Spotting...................................5-85
Child Restraints..............................................1-34
Child Restraint Systems...............................1-34
Infants and Young Children...........................1-31
Lower Anchorages and Top Tethers for
Children (LATCH System)..........................1-40
Older Children.............................................1-28
Securing a Child Restraint Designed for the
LATCH System........................................1-42
Securing a Child Restraint in a Rear Outside
Seat Position...........................................1-43
Securing a Child Restraint in the Center
Seat Position...........................................1-46
Securing a Child Restraint in the Right
Front Seat Position...................................1-46
Top Strap...................................................1-38
Top Strap Anchor Location............................1-39
Where to Put the Restraint...........................1-37
Chime Level Adjustment.................................3-108
Cigarette Lighter.............................................3-20
Cleaning Aluminum Wheels..............................5-84
Cleaning Exterior Lamps/Lenses.......................5-83
Cleaning Fabric/Carpet....................................5-79
Cleaning Glass Surfaces..................................5-81
Cleaning Interior Plastic Components.................5-81Cleaning Leather............................................5-81
Cleaning the Top of the Instrument Panel...........5-81
Cleaning the Windshield, Backglass and
Wiper Blades..............................................5-84
Cleaning Tires................................................5-84
Cleaning Vinyl................................................5-81
Cleaning........................................................5-79
Inside of Your Vehicle..................................5-79
Outside of Your Vehicle................................5-82
Underbody Maintenance...............................5-85
Video Screen............................................3-108
Weatherstrips..............................................5-82
Climate Control System...................................3-34
Climate Controls Personalization....................3-34
Dual Automatic............................................3-24
Dual..........................................................3-21
Rear..........................................................3-30
Steering Wheel Controls...............................3-34
Compact Disc Messages.................3-71, 3-81, 3-92
Compass Calibration.......................................2-35
Compass Operation.........................................2-34
Compass Variance..........................................2-35
Content Theft-Deferrent....................................2-16
Control of a Vehicle.......................................... 4-5
Convenience Net............................................2-49
Coolant.........................................................3-42
Engine Temperature Gage............................3-42
Heater, Engine............................................2-21
Cooling System..............................................5-29
Cruise Control Light........................................3-48
3

Driving (cont.)
In Rain and on Wet Roads...........................4-30
Winter........................................................4-38
Dual Automatic Climate Control System.............3-24
Dual Climate Control System............................3-21
DVD Player....................................................3-96
DVD ............................................................3-108
Cleaning the Video Screen..........................3-108
Distortion..................................................3-106
Rear Seat Entertainment System...................3-93
E
Electrical System............................................5-88
Add-On Equipment......................................5-88
Fuses and Circuit Breakers...........................5-89
Headlamps.................................................5-88
Power Windows and Other Power Options......5-88
Windshield Wiper Fuses...............................5-88
Emergency Release for Opening Liftgate............2-13
Emissions Inspection and Maintenance
Programs...................................................3-45
Engine..........................................................5-20
Air Cleaner/Filter.........................................5-20
Battery.......................................................5-41
Change Engine Oil Light...............................3-47
Check and Service Engine Soon Light............3-43Engine (cont.)
Compartment Overview................................5-12
Coolant Heater............................................2-21
Coolant Temperature Gage...........................3-42
Coolant......................................................5-24
Cooling System Inspection............................6-16
Exhaust.....................................................2-32
Fan Noise..................................................5-35
Oil .............................................................5-16
Overheating................................................5-27
Reduced Power Light...................................3-48
Starting......................................................2-20
Engine Compartment Fuse Block......................5-89
ENGINE COOLANT HOT/IDLE ENGINE.............3-61
Engine Coolant Level Check.............................6-11
Engine Oil Additives........................................5-19
Engine Oil Level Check...................................6-11
Engine Oil Scheduled Maintenance..................... 6-5
Entertainment System....................................3-108
Cleaning the Video Screen..........................3-108
DVD Distortion..........................................3-106
Entry Lighting.................................................3-19
Environmental Concerns..................................4-17
Erasing HomeLink
žButtons..............................2-42
Exit Lighting...................................................3-19
Express±Down Window....................................2-15
Extender, Safety Belt.......................................1-27
Exterior Lamps...............................................3-15
5

F
Filter.............................................................5-20
Engine Air Cleaner......................................5-20
Finding a PTY Station.....................3-68, 3-76, 3-85
Finding a Station............................3-66, 3-73, 3-83
Finish Care....................................................5-83
Finish Damage...............................................5-85
Fixed Mast Antenna.......................................3-108
Flash-to-Pass................................................... 3-9
Flat Tire, Changing.........................................5-64
Flat Tire........................................................5-63
Fluid.............................................................5-22
Automatic Transmission................................5-22
Power Steering...........................................5-36
Windshield Washer......................................5-37
FM ..............................................................3-106
Fog Lamps....................................................3-17
Following Distance..........................................4-57
Footnotes........................................................ 6-5
Four-Wheel Drive....................................2-24, 5-48
Front Axle......................................................5-49
Front Storage Area.........................................2-44
Fuel Information..............................................3-53
FUEL LEVEL LOW.........................................3-62
Fuel............................................................... 5-4
Additives...................................................... 5-6
California Fuel.............................................. 5-5
Filling a Portable Fuel Container..................... 5-9
Filling Your Tank........................................... 5-7
Fuels in Foreign Countries.............................. 5-6Fuel (cont.)
Gage.........................................................3-50
Gasoline Octane........................................... 5-4
Gasoline Speci®cations.................................. 5-5
Low Warning Light.......................................3-51
System Inspection.......................................6-16
Fuses...........................................................5-89
Fuses and Circuit Breakers...........................5-89
Windshield Wiper.........................................5-88
G
Gage............................................................3-49
Check Gages Warning Light..........................3-49
Engine Coolant Temperature.........................3-42
Fuel..........................................................3-50
Oil Pressure...............................................3-46
Speedometer..............................................3-37
Tachometer.................................................3-38
Voltmeter Gage...........................................3-40
Garage Door Opener.......................................2-39
Gasoline......................................................... 5-4
Octane........................................................ 5-4
Speci®cations............................................... 5-5
Gate Ajar Light...............................................3-50
Gate Operator and Canadian Programming........2-42
Getting Familiar with Off-Road Driving................4-17
Glove Box.....................................................2-43
GM Mobility Program for Persons with
Disabilities.................................................... 7-5
6