2021 CHEVROLET BLAZER heater

Chevrolet Blazer Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
14608203) - 2021 - CRC - 10/29/20
268 Vehicle Care
2.5L L4 Engine
1. Engine Cooling Fan (Out of View)
2. Engine Coolant Surge Tank andPressure Cap
3.6L V6 Engine
1. Engine Cooling Fan (Out of View)
2. Engine Coolant Surge Tank andPressure Cap
{Warning
An underhood electric fan can start up
even when the engine is not running and
can cause injury. Keep hands, clothing,
and tools away from any underhood
electric fan.
{Warning
Do not touch heater or radiator hoses,
or other engine parts. They can be very
hot and can burn you. Do not run the
engine if there is a leak; all coolant could
leak out. That could cause an engine fire
and can burn you. Fix any leak before
driving the vehicle.
Engine Coolant
The cooling system in the vehicle is filled
with DEX-COOL engine coolant. This coolant
needs to be checked and replaced at
appropriate intervals. See Maintenance
Schedule 0332.
The following explains the cooling system
and how to check and add coolant when it
is low. If there is a problem with engine
overheating, see Engine Overheating 0271.
What to Use
{Warning
Do not touch heater or radiator hoses,
or other engine parts. They can be very
hot and can burn you. Do not run the
(Continued)

Chevrolet Blazer Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
14608203) - 2021 - CRC - 10/29/20
272 Vehicle Care
Warning (Continued)
speed and you could be burned. Never
turn the cap when the cooling system,
including the pressure cap, is hot. Wait
for the cooling system and pressure cap
to cool.
If No Steam Is Coming from the Engine
Compartment
If an engine overheat warning is displayed
but no steam can be seen or heard, the
problem may not be too serious. Sometimes
the engine can get a little too hot when the
vehicle:
.Climbs a long hill on a hot day.
.Stops after high-speed driving.
.Idles for long periods in traffic.
If the overheat warning is displayed with no
sign of steam: 1. Turn the air conditioning off.
2. Turn the heater on to the highest temperature and to the highest fan
speed. Open the windows as necessary.
3. When it is safe to do so, pull off the road, shift to P (Park) or N (Neutral), and
let the engine idle. If the engine coolant temperature gauge is
no longer in the overheated area, the
vehicle can be driven. Continue to drive the
vehicle slowly for about 10 minutes. Keep a
safe distance from the vehicle in front. If the
warning does not come back on, continue to
drive normally and have the cooling system
checked for proper fill and function.
If the warning continues, pull over, stop, and
park the vehicle right away.
If there is no sign of steam, idle the engine
for three minutes while parked. If the
warning is still displayed, turn off the
engine until it cools down.
Washer Fluid
What to Use
When windshield washer fluid is needed, be
sure to read the manufacturer's instructions
before use. If operating the vehicle in an
area where the temperature may fall below
freezing, use a fluid that has sufficient
protection against freezing.
Adding Washer Fluid
Open the cap with the washer symbol on it.
Add washer fluid until the tank is full. See
Engine Compartment Overview
0257 for
reservoir location.
Caution
.Do not use washer fluid that contains
any type of water repellent coating.
This can cause the wiper blades to
chatter or skip.
.Do not use engine coolant (antifreeze)
in the windshield washer. It can
damage the windshield washer system
and paint.
.Do not mix water with ready-to-use
washer fluid. Water can cause the
solution to freeze and damage the
washer fluid tank and other parts of
the washer system.
(Continued)

Chevrolet Blazer Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
14608203) - 2021 - CRC - 10/29/20
Index 371
Dual Automatic Climate ControlSystem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .182
E
Electric Brake Boost . . . . . . . . . . . . . . . . . . . . . . 210
Electric Parking Brake . . . . . . . . . . . . . . . . . . . . . 211
Electric Parking Brake Light . . . . . . . . . . . . . . 102
Electrical Equipment, Add-On . . . . . . . . . . . . 252
Electrical System
Engine Compartment Fuse Block . . . . . . . 280
Fuses and Circuit Breakers . . . . . . . . . . . . . 280
Instrument Panel Fuse Block . . . . . . . . . . . 284
Overload . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 279
Rear Compartment Fuse Block . . . . . . . . . 285
Emergency OnStar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 361
Engine
Air Cleaner/Filter . . . . . . . . . . . . . . . . . . . . . . 265
Check Light (Malfunction Indicator) . . . . 100
Compartment Overview . . . . . . . . . . . . . . . . 257
Coolant Temperature Gauge . . . . . . . . . . . . 96
Coolant Temperature WarningLight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
Cooling System . . . . . . . . . . . . . . . . . . . . . . . . 267
Drive Belt Routing . . . . . . . . . . . . . . . . . . . . . 348
Exhaust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207
Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203
Oil Life System . . . . . . . . . . . . . . . . . . . . . . . . 264 Engine (cont'd)
Oil Pressure Light . . . . . . . . . . . . . . . . . . . . . . 105
Overheating . . . . . . . . . . . . . . . . . . . . . . . . . . . . 271
Power Messages . . . . . . . . . . . . . . . . . . . . . . . . 113
Running While Parked . . . . . . . . . . . . . . . . . 207
Starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202
Engine Air Filter Life System . . . . . . . . . . . . . 265
Engine Oil
Temperature Gauge . . . . . . . . . . . . . . . . . . . . . 96
Entry Lighting . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
Equipment, Towing . . . . . . . . . . . . . . . . . . . . . . 248
Event Data Recorders . . . . . . . . . . . . . . . . . . . . 359
Exit Lighting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
Extended Parking . . . . . . . . . . . . . . . . . . . . . . . . 206
Extender, Seat Belt . . . . . . . . . . . . . . . . . . . . . . . 49
Exterior Lamp Controls . . . . . . . . . . . . . . . . . . . . 121
Exterior Lamps Off Reminder . . . . . . . . . . . . . 122
Exterior Lighting Battery Saver . . . . . . . . . . . 127
F
Filter, Engine Air Cleaner . . . . . . . . . . . . . . . . . . . . . 265
Flash-to-Pass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
Flashers, Hazard Warning . . . . . . . . . . . . . . . . .124
Flat Tire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 306 Changing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 313
Floor Mats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 329 Fluid
Automatic Transmission . . . . . . . . . . . . . . . 265
Brakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 273
Washer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 272
Folding Mirrors . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Forward Collision Alert (FCA) System . . . . 230
Frequency Statement Radio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 357
Front Pedestrian Braking (FPB) System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 234
Front Seats
Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Heated and Ventilated . . . . . . . . . . . . . . . . . . 40
Fuel Additives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 240
Economy, Driving for Better . . . . . . . . . . . 188
Filling a Portable Fuel Container . . . . . . . 241
Filling the Tank . . . . . . . . . . . . . . . . . . . . . . . . 240
Foreign Countries . . . . . . . . . . . . . . . . . . . . . . 240
Gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Low Fuel Warning Light . . . . . . . . . . . . . . . 106
Management, Active . . . . . . . . . . . . . . . . . . . 206
Prohibited Fuels . . . . . . . . . . . . . . . . . . . . . . . 239
Recommended . . . . . . . . . . . . . . . . . . . . . . . . . 239
Top Tier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 239
Fuses Engine Compartment Fuse Block . . . . . . . 280
Fuses and Circuit Breakers . . . . . . . . . . . . . 280

Chevrolet Blazer Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
14608203) - 2021 - CRC - 10/29/20
372 Index
Fuses (cont'd)Instrument Panel Fuse Block . . . . . . . . . . . 284
Rear Compartment Fuse Block . . . . . . . . . 285
G
Garage Door Opener . . . . . . . . . . . . . . . . . . . . . . 117
Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
Gas Strut(s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 277
Gauges
Engine Coolant Temperature . . . . . . . . . . . . 96
Engine Oil Temperature . . . . . . . . . . . . . . . . . 96
Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Odometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Speedometer . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Tachometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Trip Odometer . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Voltmeter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Warning Lights and Indicators . . . . . . . . . . 89
General Information Service and Maintenance . . . . . . . . . . . . . . 331
Towing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 242
Vehicle Care . . . . . . . . . . . . . . . . . . . . . . . . . . . 254
Global Positioning System (GPS) . . . . . . . . . . 152
Glove Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
GM Mobility Reimbursement Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 352
Guidance Problems with the Route . . . . . . . . . . . . . . 153
H
Hazard Warning Flashers . . . . . . . . . . . . . . . . .124
HD Radio Technology . . . . . . . . . . . . . . . . . . . . . 135
Head Restraints . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
HeadlampsAiming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 278
Automatic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
Bulb Replacement . . . . . . . . . . . . . . . . . . . . . . 278
Daytime Running Lamps (DRL) . . . . . . . . . 123
Flash-to-Pass . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
High Intensity Discharge (HID)Lighting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 278
High-Beam On Light . . . . . . . . . . . . . . . . . . . 106
High/Low Beam Changer . . . . . . . . . . . . . . 122
Lamps On Reminder . . . . . . . . . . . . . . . . . . . 107
Heated Rear Seats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Steering Wheel . . . . . . . . . . . . . . . . . . . . . . . . . 83
Heated and Ventilated Front Seats . . . . . . . 40
Heated Mirrors . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Heater
Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203
Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .182
High Voltage Devices and Wiring . . . . . . . . 279
High-Beam On Light . . . . . . . . . . . . . . . . . . . . . 106
High-Speed Operation . . . . . . . . . . . . . . . . . . . 295
Hill and Mountain Roads . . . . . . . . . . . . . . . . 195
Hill Start Assist (HSA) . . . . . . . . . . . . . . . . . . . . . 212 Hood . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 255
Hooks
Shopping Bag . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Horn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
How to Wear Seat Belts Properly . . . . . . . . . 45
HVAC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .182
I
If the System Needs Service . . . . . . . . . . . . . . 153
Ignition Positions . . . . . . . . . . . . . . . . . . . . . . . . 200
Immobilizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Indicator Pedestrian Ahead . . . . . . . . . . . . . . . . . . . . . . 104
Vehicle Ahead . . . . . . . . . . . . . . . . . . . . . . . . . 103
Infants and Young Children, Restraints . . . . .61
Information Publication Ordering . . . . . . . . . . . . . . . . . . . 356
Infotainment System . . . . . . . . . . . . . . . . . . . . 359
Instrument Cluster . . . . . . . . . . . . . . . . . . . . 90, 93
Instrument Panel Overview . . . . . . . . . . . . . . . . 4
Interior Rearview Mirrors . . . . . . . . . . . . . . . . . 26
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . 1, 128
J
Jump Starting - North America . . . . . . . . . . . .318
K
Keyless Entry Remote (RKE) System . . . . . . . . . . . . . . . . . . . . 7