2003 CHEVROLET BLAZER heating

How to Check and Add Fluid
The proper ¯uid should be added if the level does not
reach the bottom of the diaphragm when it's in place in
the reservoir. See the instructions on the reservoir cap.
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:When adding coolant, it is important that
you use only DEX-COOLž(silicate-free) coolant.
If coolant other than DEX-COOLžis added to
the system, premature engine, heater core or
radiator corrosion may result. In addition, the engine
coolant will require change sooner -- at 30,000 miles
(50,000 km) or 24 months, whichever occurs ®rst.
Damage caused by the use of coolant other
than DEX-COOL
žis not covered by your new vehicle
warranty.
5-22

Add coolant mixture at the recovery tank, but be careful
not to spill it.
{CAUTION:
You can be burned if you spill coolant on hot
engine parts. Coolant contains ethylene glycol,
and it will burn if the engine parts are hot
enough. Don't spill coolant on a hot engine.
Occasionally check the coolant level in the radiator. For
information on how to add coolant to the radiator,
see
Cooling System on page 5-27.
Radiator Pressure Cap
Notice:Your radiator pressure cap is a 15 psi
(105 kPa) pressure-type cap and must be tightly
installed to prevent coolant loss and possible engine
damage from overheating. Be sure the arrows on
the cap line up with the over¯ow tube on the radiator
®ller neck.
Engine Overheating
You will ®nd a coolant temperature gage on your
vehicle's instrument panel. SeeEngine Coolant
Temperature Gage on page 3-29.
5-25

{CAUTION:
Poorly maintained and improperly used tires
are dangerous.
·Overloading your tires can cause
overheating as a result of too much
friction. You could have an air-out and a
serious accident. See ªLoading Your
Vehicleº in the Index.
·Underin¯ated tires pose the same danger
as overloaded tires. The resulting accident
could cause serious injury. Check all tires
frequently to maintain the recommended
pressure. Tire pressure should be checked
when your tires are cold.
·Overin¯ated tires are more likely to be
cut, punctured or broken by a sudden
impact Ð such as when you hit a pothole.
Keep tires at the recommended pressure.
·Worn, old tires can cause accidents. If
your tread is badly worn, or if your tires
have been damaged, replace them.
In¯ation -- Tire Pressure
The Certi®cation/Tire label, which is on the driver's door
edge, above the door latch, shows the correct in¯ation
pressures for your tires when they're cold. ªColdº means
your vehicle has been sitting for at least three hours
or driven no more than 1 mile (1.6 km).
Notice:Don't let anyone tell you that underin¯ation
or overin¯ation is all right. It's not. If your tires
don't have enough air (underin¯ation), you can get
the following:
·Too much ¯exing
·Too much heat
·Tire overloading
·Bad wear
·Bad handling
·Bad fuel economy
If your tires have too much air (overin¯ation), you
can get the following:
·Unusual wear
·Bad handling
·Rough ride
·Needless damage from road hazards
5-55

Fuse Usage
4 Gages, Body Control Module,
Instrument Panel Cluster
5 Parking Lamps, Power Window
Switch, Body Control Module,
Ashtray Lamp
6 Steering Wheel Radio Controls
7 Headlamps Switch, Body Control
Module, Headlamp Relay
8 Courtesy Lamps, Battery Run-Down
Protection
9 Heating, Ventilation, Air Cooling
Control Head (Manual)
10 Turn Signal
11 Cluster, Engine Control Module
12 Interior Lights
13 Auxiliary Power
14 Power Locks MotorFuse Usage
15 4WD Switch, Engine Controls (VCM,
PCM, Transmission)
16 Supplemental In¯atable Restraint
17 Front Wiper
18 Steering Wheel Radio Controls
19 Radio, Battery
20 Ampli®er
21 Heating, Ventilation, Air Cooling
(Manual), Heating,Ventilation, Air
Cooling (Automatic), Heating,
Ventilation, Air Cooling Sensors
(Automatic)
22 Anti-Lock Brakes
23 Rear Wiper
24 Radio, Ignition
5-87

Fuse Usage
PARKLP Parking Lamps
LR PRK Left Rear Parking Lamps
LIFTGLASS Liftglass
IGN C Starter Solenoid, Fuel Pump,
PRNDL
HTDSEAT Heated Seat
HVAC Heating,Ventilation, Air Cooling
System
TRCHMSL Trailer Center High Mount Stop Light
RRDFOG Rear Defogger
TBC Truck Body ComputerFuse Usage
CRANK Clutch Switch, NSBU Switch
CHMSL Center High Mounted Stoplamp
HAZLP Hazard Lamps
VECHMSL Vehicle Center High-Mounted Stop
Lamp
RR DEFOG Rear Defogger
HTDMIR Heated Mirror
ATC Transfer Case (Four-Wheel Drive)
STOPLP Stop Lamps
RR W/W Rear Window Wiper
5-90

Driving On Grades..........................................4-62
Driving on Off-Road Hills.................................4-19
Driving on Snow or Ice....................................4-38
Driving Through Deep Standing Water...............4-32
Driving Through Flowing Water.........................4-32
Driving Uphill..................................................4-20
Driving with a Trailer.......................................4-60
Driving..........................................................4-28
At Night.....................................................4-28
City...........................................................4-33
Defensive..................................................... 4-3
Drunken....................................................... 4-4
Environment................................................. 4-3
Freeway.....................................................4-34
Hill and Mountain Roads..............................4-36
In Rain and on Wet Roads...........................4-30
Winter........................................................4-38
E
Electrical System............................................5-84
Add-On Equipment......................................5-84
Fuses and Circuit Breakers...........................5-85
Headlamps.................................................5-84
Power Windows and Other Power Options......5-85
Windshield Wiper Fuses...............................5-85
Electronic Transfer Case..................................2-29
Emergency Release for Opening Tailgate...........2-15Emissions Inspection and Maintenance
Programs...................................................3-32
Engine Compartment Fuse Block......................5-88
Engine Coolant Level Check.............................6-26
Engine Oil Additives........................................5-14
Engine Oil Level Check...................................6-26
Engine..........................................................5-15
Air Cleaner/Filter.........................................5-15
Battery.......................................................5-40
Check and Service Engine Soon Light............3-30
Compartment Overview................................5-10
Coolant Heater............................................2-22
Coolant Temperature Gage...........................3-29
Coolant......................................................5-22
Cooling System Inspection............................6-31
Exhaust.....................................................2-39
Fan Noise..................................................5-34
Oil .............................................................5-11
Overheating................................................5-25
Starting......................................................2-21
Entry Lighting.................................................3-14
Environmental Concerns..................................4-17
Erasing HomeLink
žButtons..............................2-47
Exit Lighting...................................................3-14
Express Down Window....................................2-12
Extender, Safety Belt.......................................1-31
Exterior Lamps...............................................3-11
5

Gate Operator and Canadian Programming........2-47
Getting Familiar with Off-Road Driving................4-17
Glove Box.....................................................2-48
GM Mobility Program for Persons with
Disabilities.................................................... 7-6
H
Hazard Warning Flashers................................... 3-3
Head Restraints............................................... 1-7
Headlamp High/Low-Beam Changer.................... 3-6
Headlamps....................................................5-48
Bulb Replacement.......................................5-47
Electrical System.........................................5-84
Halogen Bulbs............................................5-47
One-Piece Front Turn Signal Lamps...............5-50
Two-Piece Front Turn Signal Lamps...............5-50
Heated Seats................................................... 1-5
Heating.........................................................3-18
Highway Hypnosis...........................................4-36
Hill and Mountain Roads..................................4-36
Hitches..........................................................4-59
HomeLink Transmitter, Programming..................2-45
HomeLink
žTransmitter....................................2-44
Hood.............................................................. 5-8
Checking Things Under.................................. 5-8
Release....................................................... 5-9
Horn............................................................... 3-4How to Add Coolant to the Coolant
Recovery Tank............................................5-29
How to Add Coolant to the Radiator..................5-31
How to Add Fluid....................................5-19, 5-21
How to Check and Add Fluid............................5-22
How to Check Lubricant..........................5-45, 5-46
How to Check Power Steering Fluid..................5-35
How to Check................................5-17, 5-20, 5-56
How to Inspect the Engine Air
Cleaner/Filter..............................................5-16
How to Use This Manual...................................... ii
How to Wear Safety Belts Properly...................1-14
Hydraulic Clutch System Check........................6-28
Hydraulic Clutch.............................................5-21
Hydroplaning..................................................4-31
I
If No Steam Is Coming From Your Engine..........5-26
If Steam Is Coming From Your Engine...............5-26
If the Light Is Flashing.....................................3-31
If the Light Is On Steady.................................3-31
If You Are Stuck in Sand, Mud, Ice or Snow.......4-42
If You Decide To Pull A Trailer..........................4-55
If You're Caught in a Blizzard...........................4-40
Ignition Positions.............................................2-19
Ignition Transmission Lock Check......................6-29
Infants and Young Children, Restraints...............1-34
In¯ation -- Tire Pressure..................................5-55
7