2003 CHEVROLET BLAZER heater

If you get the overheat warning with no sign of steam,
try this for a minute or so:
1. In heavy traffic, let the engine idle in NEUTRAL
while stopped. If it is safe to do so, pull off the
road, shift to PARK (P) or NEUTRAL and let the
engine idle.
2. Turn on your heater to full hot at the highest fan
speed and open the window as necessary.
If you no longer have the overheat warning, you can
drive. Just to be safe, drive slower for about 10 minutes.
If the warning doesn't come back on, you can drive
normally.
If the warning continues, pull over, stop, and park your
vehicle right away.
If there's still no sign of steam, idle the engine for three
minutes while you're parked. Push down the accelerator
until the engine speed is about twice as fast as
normal idle speed for at least three minutes while you're
parked. If you still have the warning,
turn off the
engine and get everyone out of the vehicleuntil it
cools down.
You may decide not to lift the hood but to get service
help right away.
Cooling System
When you decide it's safe to lift the hood, here's what
you'll see:
A. Coolant Recovery Tank
B. Radiator Pressure Cap
C. Engine Cooling Fan
If the coolant inside the coolant recovery tank is boiling,
don't do anything else until it cools down. The vehicle
should be parked on a level surface.
5-27

When the engine is cold, the coolant level should be at
least up to the ADD mark. If it isn't, 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. Don't touch them. If you
do, you can be burned.
Don't 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.
If there seems to be no leak, start the engine again.
The engine cooling fan speed should increase when idle
speed is doubled by pushing the accelerator pedal
down. If it doesn't, your vehicle needs service. Turn off
the engine.
Notice:Engine damage from running your engine
without coolant isn't covered by your warranty.
5-28

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 Ð 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.
How to Add Coolant to the Coolant
Recovery Tank
If you haven't found a problem yet, but the coolant level
isn't at the ADD mark, add a 50/50 mixture ofclean,
drinkable waterand DEX-COOLžengine coolant at the
coolant recovery tank. SeeEngine Coolant on
page 5-22for more information.
{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 wouldn't 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
žcoolant.
Notice:In cold weather, water can freeze and crack
the engine, radiator, heater core and other parts.
Use the recommended coolant and the proper
coolant mixture.
5-29

Content Theft-Deferrent....................................2-17
Control of a Vehicle.......................................... 4-7
Convenience Net............................................2-57
Convenience System, Rear..............................2-59
Coolant.........................................................3-29
Engine Temperature Gage............................3-29
Heater, Engine............................................2-22
Cooling System..............................................5-27
Cooling.........................................................3-18
Cruise Control.................................................. 3-8
Current and Past Model Order Forms................7-12
Customer Assistance Information........................ 7-8
Courtesy Transportation.................................. 7-8
Customer Assistance for Text Telephone
(TTY) Users.............................................. 7-4
Customer Assistance Offices........................... 7-4
Customer Satisfaction Procedure..................... 7-2
GM Mobility Program for Persons with
Disabilities................................................ 7-6
Reporting Safety Defects to General Motors....7-10
Reporting Safety Defects to the Canadian
Government............................................7-10
Reporting Safety Defects to the United
States Government...................................7-10
Roadside Assistance Program......................... 7-6
Service Publications Ordering Information........7-11D
Daytime Running Lamps..................................3-12
Defensive Driving............................................. 4-3
Defogging and Defrosting.................................3-19
Dinghy Towing................................................4-46
Directing the Air¯ow........................................3-17
Doing Your Own Service Work........................... 5-3
Dolly Towing (Two-Wheel Drive Vehicles)...........4-50
Dolly Towing (Vehicles with Automatic
Transfer Case)............................................4-48
Dolly Towing (Vehicles with Electronic
Transfer Case)............................................4-48
Dome Lamps.................................................3-15
Door............................................................... 2-7
Locks.......................................................... 2-7
Power Door Locks......................................... 2-8
Programmable Automatic Door Locks............... 2-8
Rear Door Security Locks.............................2-10
Driver Behavior................................................ 4-2
Driver Information Center (DIC).........................2-53
Driver............................................................1-15
Position, Safety Belt.....................................1-15
Driving Across an Incline..................................4-24
Driving Downhill..............................................4-23
Driving in Mud, Sand, Snow or Ice....................4-26
Driving in Water..............................................4-27
4

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

Stalling on an Incline.......................................4-25
Starter Switch Check.......................................6-28
Starting Your Engine.......................................2-21
Starting Your V6 Engine..................................2-21
Steering in Emergencies..................................4-11
Steering, Suspension and Front Drive Axle
Boot and Seal Inspection..............................6-31
Steering Tips..................................................4-11
Steering........................................................4-10
Storage Areas................................................2-57
Convenience Net.........................................2-57
Front Storage Area......................................2-55
Glove Box..................................................2-48
Luggage Carrier..........................................2-56
Overhead Console.......................................2-48
Rear Convenience System............................2-59
Storage.........................................................2-56
Garment Hooks...........................................2-56
Storing a Flat or Spare Tire and Tools...............5-72
Stuck in Sand, Mud, Ice or Snow......................4-42
Sun Visors.....................................................2-16
Sunglasses Storage Compartment.....................2-52
Swing-Out Windows........................................2-13
T
Tachometer....................................................3-24
Tailgate Release.............................................2-14
Tailgate-Mounted Spare...................................2-16Taillamps.......................................................5-51
Temperature and Compass Display....................2-51
Testing the Alarm............................................2-18
Theft-Deterrent, Radio.....................................3-68
Theft-Deterrent Systems...................................2-17
Content Theft-Deterrent................................2-17
Passlock
ž...................................................2-18
Throttle System Inspection...............................6-32
Tilt Wheel........................................................ 3-4
Time Delay....................................................2-41
Tire In¯ation Check.........................................6-26
Tires.............................................................5-54
Buying New Tires........................................5-58
Chains.......................................................5-62
Changing a Flat Tire....................................5-63
Compact Spare Tire.....................................5-75
If a Tire Goes Flat.......................................5-62
In¯ation -- Tire Pressure...............................5-55
Inspection and Rotation................................5-56
Spare Tire..................................................5-76
Uniform Tire Quality Grading.........................5-59
Wheel Alignment and Tire Balance.................5-60
Wheel Replacement.....................................5-60
When It Is Time for New Tires......................5-57
To Use the Engine Coolant Heater....................2-22
Top Strap Anchor Location...............................1-43
Top Strap......................................................1-42
Torque Lock...................................................2-37
Total Weight on Your Vehicle's Tires..................4-59
Tow/Haul Mode Light.......................................3-35
14