2021 CHEVROLET BLAZER oil pressure

Chevrolet Blazer Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
14608203) - 2021 - CRC - 10/29/20
324 Vehicle Care
Dry the finish with a soft, clean chamois or
an all-cotton towel to avoid surface
scratches and water spotting.
Cleaning Underhood Components
Caution
Do not power wash any component
under the hood that has this
e
symbol.
This could cause damage that would not
be covered by the vehicle warranty.
Solvents or aggressive cleaners may harm
underhood components. The usages of these
chemicals should be avoided.
Recommend water only.
A pressure washer may be used, but care
must be utilized. The following criteria must
be followed:
.Water pressure must be kept below
14 000 KPa (2,000 PSI).
.Water temperature must be below 80 °C
(180 °F).
.Spray nozzle with a 40 degree wide angle
spray pattern or wider must be used.
.Nozzle must be kept at least 30 cm (1 ft)
away from all surfaces.
Finish Care
Application of aftermarket clearcoat sealant/
wax materials is not recommended.
If painted surfaces are damaged, see your
dealer to have the damage assessed and
repaired. Foreign materials such as calcium
chloride and other salts, ice melting agents,
road oil and tar, tree sap, bird droppings,
chemicals from industrial chimneys, etc., can
damage the vehicle's finish if they remain
on painted surfaces. Wash the vehicle as
soon as possible. If necessary, use
non-abrasive cleaners that are marked safe
for painted surfaces to remove foreign
matter.
Occasional hand waxing or mild polishing
should be done to remove residue from the
paint finish. See your dealer for approved
cleaning products.
Do not apply waxes or polishes to uncoated
plastic, vinyl, rubber, decals, simulated
wood, or flat paint as damage can occur.
Caution
Machine compounding or aggressive
polishing on a basecoat/clearcoat paint
finish may damage it. Use only
(Continued)
Caution (Continued)
non-abrasive waxes and polishes that are
made for a basecoat/clearcoat paint finish
on the vehicle.
To keep the paint finish looking new, keep
the vehicle garaged or covered whenever
possible.
Protecting Exterior Bright Metal Moldings
Caution
Failure to clean and protect the bright
metal moldings can result in a hazy
white finish or pitting. This damage
would not be covered by the vehicle
warranty.
The bright metal moldings on the vehicle
are aluminum, chrome, or stainless steel. To
prevent damage always follow these
cleaning instructions:
.Be sure the molding is cool to the touch
before applying any cleaning solution.
.Use only approved cleaning solutions for
aluminum, chrome, or stainless steel.
Some cleaners are highly acidic or contain
alkaline substances and can damage the
moldings.

Chevrolet Blazer Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
14608203) - 2021 - CRC - 10/29/20
Vehicle Care 327
Body Component Lubrication
Lubricate all key lock cylinders, hood hinges,
liftgate hinges, and the steel fuel door
hinges, unless the components are plastic.
Applying silicone grease on weatherstrips
with a clean cloth will make them last
longer, seal better, and not stick or squeak.
Underbody Maintenance
At least twice a year, spring and fall, use
plain water to flush any corrosive materials
from the underbody. Take care to
thoroughly clean any areas where mud and
other debris can collect.
Do not directly power wash the transfer
case and/or front/rear axle output seals.
High pressure water can overcome the seals
and contaminate the fluid. Contaminated
fluid will decrease the life of the transfer
case and/or axles and should be replaced.
Sheet Metal Damage
If the vehicle is damaged and requires sheet
metal repair or replacement, make sure the
body repair shop applies anti-corrosion
material to parts repaired or replaced to
restore corrosion protection.Original manufacturer replacement parts will
provide the corrosion protection while
maintaining the vehicle warranty.
Finish Damage
Quickly repair minor chips and scratches
with touch-up materials available from your
dealer to avoid corrosion. Larger areas of
finish damage can be corrected in your
dealer's body and paint shop.
Chemical Paint Spotting
Airborne pollutants can fall upon and attack
painted vehicle surfaces causing blotchy,
ring-shaped discolorations, and small,
irregular dark spots etched into the paint
surface. See
“Finish Care” previously in this
section.
Interior Care
To prevent dirt particle abrasions, regularly
clean the vehicle's interior. Immediately
remove any soils. Newspapers or dark
garments can transfer color to the vehicle’s
interior.
Use a soft bristle brush to remove dust from
knobs and crevices on the instrument
cluster. Using a mild soap solution,
immediately remove hand lotions, sunscreen, and insect repellent from all
interior surfaces or permanent damage may
result.
Use cleaners specifically designed for the
surfaces being cleaned to prevent
permanent damage. Apply all cleaners
directly to the cleaning cloth. Do not spray
cleaners on any switches or controls.
Remove cleaners quickly.
Before using cleaners, read and follow all
safety instructions on the label. While
cleaning the interior, open the doors and
windows to get proper ventilation.
To prevent damage, do not clean the
interior using the following cleaners or
techniques:
.Never use a razor or any other sharp
object to remove soil from any interior
surface.
.Never use a brush with stiff bristles.
.Never rub any surface aggressively or
with too much pressure.
.Do not use laundry detergents or
dishwashing soaps with degreasers. For
liquid cleaners, use approximately
20 drops per 3.8 L (1 gal) of water.
A concentrated soap solution will create

Chevrolet Blazer Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
14608203) - 2021 - CRC - 10/29/20
332 Service and Maintenance
Because of the way people use vehicles,
maintenance needs vary. There may need to
be more frequent checks and services. The
Additional Required Services - Normal are for
vehicles that:
.Carry passengers and cargo within
recommended limits on the Tire and
Loading Information label. SeeVehicle
Load Limits 0197.
.Are driven on reasonable road surfaces
within legal driving limits.
.Use the recommended fuel. See
Recommended Fuel 0239.
Refer to the information in the Maintenance
Schedule Additional Required Services -
Normal chart.
The Additional Required Services - Severe are
for vehicles that are:
.Mainly driven in heavy city traffic in hot
weather.
.Mainly driven in hilly or mountainous
terrain.
.Frequently towing a trailer.
.Used for high speed or competitive
driving.
.Used for taxi, police, or delivery service. Refer to the information in the Maintenance
Schedule Additional Required Services -
Severe chart.
{Warning
Performing maintenance work can be
dangerous and can cause serious injury.
Perform maintenance work only if the
required information, proper tools, and
equipment are available. If they are not,
see your dealer to have a trained
technician do the work. See
Doing Your
Own Service Work 0255.
Maintenance Schedule
Owner Checks and Services
Check the engine oil level. See Engine Oil
0 262.
Once a Month
.Check the tire inflation pressures. See Tire
Pressure 0294.
.Inspect the tires for wear. See Tire
Inspection 0300.
.Check the windshield washer fluid level.
See Washer Fluid 0272.
Engine Oil Change
When the CHANGE ENGINE OIL SOON
message displays, have the engine oil and
filter changed within the next 1 000 km/
600 mi. If driven under the best conditions,
the engine oil life system may not indicate
the need for vehicle service for up to a year.
The engine oil and filter must be changed at
least once a year and the oil life system
must be reset. Your trained dealer technician
can perform this work. If the engine oil life
system is reset accidentally, service the
vehicle within 5 000 km/3,000 mi since the
last service. Reset the oil life system when
the oil is changed. See Engine Oil Life
System 0264.
Engine Air Filter Change
When the REPLACE AT NEXT OIL CHANGE
message displays, the engine air filter
should be replaced at the next engine oil
change. When the REPLACE ENGINE AIR
FILTER SOON message displays, the engine
air filter should be replaced at the earliest
convenience. Reset the engine air filter life
system after the engine air filter is replaced.
See Engine Air Filter Life System 0265.

Chevrolet Blazer Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
14608203) - 2021 - CRC - 10/29/20
Service and Maintenance 333
Air Conditioning Desiccant (Replace Every
Seven Years)
The air conditioning system requires
maintenance every seven years. This service
requires replacement of the desiccant to
help the longevity and efficient operation of
the air conditioning system. This service can
be complex. See your dealer.
Tire Rotation and Required Services
Every 12 000 km/7,500 mi
Rotate the tires, if recommended for the
vehicle, and perform the following services.
SeeTire Rotation 0300.
.Check engine oil level and oil
life percentage. If needed, change engine
oil and filter, and reset oil life system.
See Engine Oil 0262 and
Engine Oil Life System 0264.
.Check the air filter life percentage.
If necessary, replace the engine air filter
and reset the engine air filter life system.
See Engine Air Filter Life System 0265.
.Check engine coolant level. See Cooling
System 0267.
.Check windshield washer fluid level. See
Washer Fluid 0272.
.Check tire inflation pressures. See Tire
Pressure 0294.
.Inspect tire wear. See Tire Inspection
0 300.
.Visually check for fluid leaks.
.Inspect brake system. See Exterior Care
0 323.
.Visually inspect steering, suspension, and
chassis components for damage, including
cracks or tears in the rubber boots, loose
or missing parts, or signs of wear at least
once a year. See Exterior Care0323.
.Inspect power steering for proper
electrical connections, binding, cracks,
chafing, etc.
.Visually inspect halfshafts and drive
shafts for excessive wear, lubricant leaks,
and/or damage including: tube dents or
cracks, constant velocity joint or universal
joint looseness, cracked or missing boots,
loose or missing boot clamps, center
bearing excessive looseness, loose or
missing fasteners, and axle seal leaks.
.Check restraint system components. See
Safety System Check 049.
.Visually inspect the fuel system, including
the evaporative (EVAP) system, for
damage or leaks. Visually check all fuel pipes, vapor lines, and hoses for proper
attachment, connection, routing, and
condition.
.Visually inspect exhaust system and
nearby heat shields for loose or damaged
parts.
.Lubricate body components. See
Exterior
Care 0323.
.Check automatic transmission shift lock
control function. See Automatic
Transmission Shift Lock Control Function
Check 0275.
.Check parking brake and automatic
transmission park mechanism. See Park
Brake and P (Park) Mechanism Check
0 275.
.Check accelerator pedal for damage, high
effort, or binding. Replace if needed.
.Visually inspect gas strut for signs of
wear, cracks, or other damage. Check the
hold open ability of the strut. If the hold
open ability is low, service the gas strut.
See Gas Strut(s) 0277.
.Check tire sealant expiration date,
if equipped. See Tire Sealant and
Compressor Kit 0307.
.Inspect sunroof track and seal,
if equipped. See Sunroof031.

Chevrolet Blazer Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
14608203) - 2021 - CRC - 10/29/20
Service and Maintenance 335
Footnotes—Maintenance Schedule
Additional Required Services - Normal
(1) Or every four years, whichever comes
first. If driving in dusty conditions, inspect
the filter at each oil change or more often
as needed. See Engine Air Cleaner/Filter
0 265.
(2) Or every two years, whichever comes
first. More frequent passenger compartment
air filter replacement may be needed if
driving in areas with heavy traffic, poor air
quality, high dust levels, or environmental
allergens. Passenger compartment air filter
replacement may also be needed if there is
reduced airflow, window fogging, or odors.
Your GM dealer can help determine when to
replace the filter. (3)
Do not directly power wash the transfer
case and/or front/rear axle output seals.
High pressure water can overcome the seals
and contaminate the transfer case fluid.
Contaminated fluid will decrease the life of
the transfer case and/or axles and should be
replaced.
(4) Or every five years, whichever comes
first. See Cooling System 0267.
(5) Or every 10 years, whichever comes first.
Inspect for fraying, excessive cracking,
or damage; replace, if needed. (6)
Replace brake fluid every five years. See
Brake Fluid 0273.
(7) Or every 12 months, whichever comes
first. See Wiper Blade Replacement 0276.
(8) Or every 10 years, whichever comes first.
See Gas Strut(s) 0277.
(9) Replace air conditioning desiccant every
seven years.

Chevrolet Blazer Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
14608203) - 2021 - CRC - 10/29/20
Service and Maintenance 337
Footnotes—Maintenance Schedule
Additional Required Services - Severe
(1) Or every four years, whichever comes
first. If driving in dusty conditions, inspect
the filter at each oil change or more often
as needed. See Engine Air Cleaner/Filter
0 265.
(2) Or every two years, whichever comes
first. More frequent passenger compartment
air filter replacement may be needed if
driving in areas with heavy traffic, poor air
quality, high dust levels, or environmental
allergens. Passenger compartment air filter
replacement may also be needed if there is
reduced airflow, window fogging, or odors.
Your GM dealer can help determine when to
replace the filter.
(3) Do not directly power wash the transfer
case and/or front/rear axle output seals.
High pressure water can overcome the seals
and contaminate the transfer case fluid.
Contaminated fluid will decrease the life of
the transfer case and/or axles and should be
replaced.
(4) Or every five years, whichever comes
first. See Cooling System 0267. (5)
Or every 10 years, whichever comes first.
Inspect for fraying, excessive cracking,
or damage; replace, if needed.
(6) Replace brake fluid every five years. See
Brake Fluid 0273.
(7) Or every 12 months, whichever comes
first. See Wiper Blade Replacement 0276.
(8) Or every 10 years, whichever comes first.
See Gas Strut(s) 0277.
(9) Replace air conditioning desiccant every
seven years.
Special Application Services
.Severe Commercial Use Vehicles Only:
Lubricate chassis components every oil
change.
.Have underbody flushing service
performed. See "Underbody Maintenance"
in Exterior Care 0323.
Additional Maintenance
and Care
Your vehicle is an important investment and
caring for it properly may help to avoid
future costly repairs. To maintain vehicle
performance, additional maintenance
services may be required.
It is recommended that your dealer perform
these services —their trained dealer
technicians know your vehicle best. Your
dealer can also perform a thorough
assessment with a multi-point inspection to
recommend when your vehicle may need
attention.
The following list is intended to explain the
services and conditions to look for that may
indicate services are required.
Battery
The 12-volt battery supplies power to start
the engine and operate any additional
electrical accessories.
.To avoid break-down or failure to start
the vehicle, maintain a battery with full
cranking power.

Chevrolet Blazer Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
14608203) - 2021 - CRC - 10/29/20
366 Connected Services
PressQ, then ask the Advisor to download
directions to the vehicle’s navigation system,
if equipped. After the call ends, the
navigation screen will provide prompts to
begin driving directions. Routes that are sent
to the navigation screen can only be
canceled through the navigation system.
See www.onstar.com (U.S.) or www.onstar.ca
(Canada).
Connections
The following services help with staying
connected.
For coverage maps, see www.onstar.com
(U.S.) or www.onstar.ca (Canada).
Ensuring Security
.Change the default passwords for the
Wi-Fi hotspot and myChevrolet mobile
application. Make these passwords
different from each other and use a
combination of letters and numbers to
increase the security.
.Change the default name of the SSID
(Service Set Identifier). This is your
network’s name that is visible to other
wireless devices. Choose a unique name
and avoid family names or vehicle
descriptions. Wi-Fi Hotspot (If Equipped)
The vehicle may have a built-in Wi-Fi
hotspot that provides access to the Internet
and web content at 4G LTE speed. Up to
seven mobile devices can be connected.
A data plan is required. Use the in-vehicle
controls only when it is safe to do so.
1. To retrieve Wi-Fi hotspot information, press
=to open the OnStar app on the
infotainment display, then select Wi-Fi
Hotspot. On some vehicles, touch Wi-Fi
or Wi-Fi Settings on the screen.
2. The Wi-Fi settings will display the Wi-Fi hotspot name (SSID), password, and on
some vehicles, the connection type (no
Internet connection, 3G, 4G, 4G LTE), and
signal quality (poor, good, excellent). The
LTE icon shows connection to Wi-Fi. It is
possible that the icon may not illuminate
even though the vehicle has an active
connection.
3. To change the SSID or password, press
Qor call 1-888-4ONSTAR to connect
with an Advisor. On some vehicles, the
SSID and password can be changed in
the Wi-Fi Hotspot menu. After initial set-up, your vehicle’s Wi-Fi
hotspot will connect automatically to your
mobile devices. Manage data usage by
turning Wi-Fi on or off on your mobile
device, using the myChevrolet mobile app,
or by contacting an OnStar Advisor. On
some vehicles, Wi-Fi can also be managed
from the Wi-Fi Hotspot menu.
MyChevrolet Mobile App (If Available)
Download the myChevrolet mobile app to
compatible Apple and Android smartphones.
Chevrolet users can access the following
services from a smartphone:
.Remotely start/stop the vehicle,
if factory-equipped.
.Lock/unlock doors, if equipped with
automatic locks.
.Activate the horn and lamps.
.Check the vehicle’s fuel level, oil life,
or tire pressure, if factory-equipped with
the Tire Pressure Monitor System.
.Send destinations to the vehicle.
.Locate the vehicle on a map (U.S.
market only).
.Turn the vehicle's Wi-Fi hotspot on/off,
manage settings, and monitor data
consumption, if equipped.
.Locate a dealer and schedule service.

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