2008 GMC SIERRA engine coolant

Adding Washer Fluid
Your vehicle has a low washer uid message in the DIC
that comes on when the washer uid is low. The
message is displayed for 15 seconds at the start of
each ignition cycle. When the WASHER FLUID LOW
ADD FLUID message displays, you will need to add
washer uid to the windshield washer uid reservoir.
Open the cap with the
washer symbol on it. Add
washer uid until the tank
is full. SeeEngine
Compartment Overview on
page 5-14for reservoir
location.Notice:
When using concentrated washer uid,
follow the manufacturer’s instructions for
adding water.
Do not mix water with ready-to-use washer uid.
Water can cause the solution to freeze and
damage your washer uid tank and other parts of
the washer system. Also, water does not clean as
well as washer uid.
Fill the washer uid tank only three-quarters full
when it is very cold. This allows for uid
expansion if freezing occurs, which could
damage the tank if it is completely full.
Do not use engine coolant (antifreeze) in your
windshield washer. It can damage the vehicle’s
windshield washer system and paint.
5-41

ApplicationCapacities
English Metric
2500 Series Standard Box 26.0 gal 98.0 L
2500 Series and 3500 Series Long Box 34.0 gal 128.7 L
3500 Series Chassis Cab 50.0 gal 189.0 L
3500 Chassis Cab – Front Tank 27.0 gal 102.0 L
3500 Chassis Cab – Rear Tank 23.0 gal (if equipped) 87.0 L
Transmission Fluid (Pan Removal and Filter Replacement)
Auto 4-Speed Transmission 4L60-E Electronic
Transmission5.0 qt 4.7 L
Auto 4-Speed Transmission 4L70-E Super Duty
Transmission5.0 qt 4.7 L
Auto 6-Speed Transmission 6L80-E 6.0 qt 5.7 L
Auto 6-Speed Transmission 6L90-E 6.3 qt 6.0 L
Auto 6-Speed Transmission Allison 7.4 qt 7.0 L
Transfer Case Fluid 1.6 qt 1.5 L
Wheel Nut Torque 140 ft lb 190Y
After rell, the level must be rechecked. Add enough engine coolant so that the uid is within the proper
operating range.
5-131

MaintenanceI— Use MaintenanceIif the
CHANGE ENGINE OIL SOON message comes
on within 10 months since the vehicle was purchased
or MaintenanceIIwas performed.MaintenanceII— Use MaintenanceIIif the previous
service performed was MaintenanceI. Always use
MaintenanceIIwhenever the message comes on
10 months or more since the last service or if the
message has not come on at all for one year.
Scheduled Maintenance
Service MaintenanceIMaintenanceII
Change engine oil and lter. SeeEngine Oil (Gasoline Engine) on page 5-15.
Reset oil life system. SeeEngine Oil Life System on page 5-18.An Emission
Control Service.••
Allison Transmission
®only: Replace external transmission lter at the rst
maintenance service performed on the vehicle.
Lubricate chassis components.See footnote #.••
Visually check for any leaks or damage.See footnote (j).••
Inspect engine air cleaner lter or change indicator (if equipped). If
necessary, replace lter. SeeEngine Air Cleaner/Filter (Gasoline Engines) on
page 5-19.See footnote (p).•
Rotate tires and check ination pressures and wear. SeeTire Inspection and
Rotation on page 5-81and “Tire Wear Inspection” inAt Least Once a Month
on page 6-12.••
Inspect brake system.See footnote (a).••
Check engine coolant and windshield washer uid levels and add uid
as needed.••
6-5

(e)Make sure the safety belt reminder light and safety
belt assemblies are working properly. Look for any
other loose or damaged safety belt system parts. If you
see anything that might keep a safety belt system
from doing its job, have it repaired. Have any torn or
frayed safety belts replaced. Also see Checking
the Restraint Systems on page 1-87.
(f)Lubricate all key lock cylinders, body door hinges,
hood latch assembly, secondary latch, pivots, spring
anchor, release pawl, tailgate hinges, tailgate linkage,
tailgate handle pivot points, latch bolt, fuel door
hinge, locks, and folding seat hardware. More frequent
lubrication may be required when exposed to a
corrosive environment. Applying silicone grease on
weatherstrips with a clean cloth will make them
last longer, seal better, and not stick or squeak.
(g)Check vent hose at transfer case for kinks and
proper installation. Check to be sure vent hose
is unobstructed, clear, and free of debris.(h)Change automatic transmission fluid and filter if the
vehicle Gross Vehicle Weight Rating (GVWR) is
over 8600 lbs or if the vehicle is mainly driven under
one or more of these conditions:
In heavy city traffic where the outside temperature
regularly reaches 90°F (32°C) or higher.
In hilly or mountainous terrain.
When doing frequent trailer towing.
Uses such as found in taxi, police or delivery
service.
(i)Drain, flush, and refill cooling system. This service can
be complex; you should have your dealer/retailer perform
this service. See Engine Coolant on page 5-28for what to
use. Inspect hoses. Clean radiator, condenser, pressure
cap, and ller neck. Pressure test the cooling system and
pressure cap.
(j)A fluid loss in any vehicle system could indicate a
problem. Have the system inspected and repaired and
the fluid level checked. Add fluid if needed.
(k)Inspect system. Check all fuel and vapor lines and
hoses for proper hook-up, routing, and condition. Check
that the purge valve, if the vehicle has one, works
properly. Replace as needed.
6-10

Engine Oil Level Check
Notice:It is important to check the engine oil
regularly and keep it at the proper level. Failure to
keep the engine oil at the proper level can cause
damage to the engine not covered by your warranty.
Check the engine oil level and add the proper oil if
necessary. SeeEngine Oil (Gasoline Engine) on
page 5-15.
Engine Coolant Level Check
Check the engine coolant level and add DEX-COOL®
coolant mixture if necessary. SeeEngine Coolant
on page 5-28.
Windshield Washer Fluid Level Check
Check the windshield washer uid level in the windshield
washer uid reservoir and add the proper uid if
necessary.
At Least Once a Month
Tire Ination Check
Inspect your vehicle’s tires and make sure they are
inated to the correct pressures. Do not forget to check
the spare tire. SeeInflation - Tire Pressure on
page 5-74. Check to make sure the spare tire is stored
securely. SeeChanging a Flat Tire on page 5-92.
Tire Wear Inspection
Tire rotation may be required for high mileage highway
drivers prior to the Engine Oil Life System service
notication. Check the tires for wear and, if necessary,
rotate the tires. SeeTire Inspection and Rotation on
page 5-81.
6-12

Recommended Fluids and
Lubricants
This maintenance section applies to vehicles with a
gasoline engine. If your vehicle has a diesel engine, see
the maintenance schedule section in the DURAMAX
®
Diesel manual.
Fluids and lubricants identied below by name, part
number, or specication can be obtained from your
dealer/retailer.
Usage Fluid/Lubricant
Engine OilEngine oil which meets GM
Standard GM6094M and displays
the American Petroleum Institute
Certied for Gasoline Engines
starburst symbol. To determine the
proper viscosity for your vehicle’s
engine, seeEngine Oil (Gasoline
Engine) on page 5-15.
Engine Coolant50/50 mixture of clean, drinkable
water and use only DEX-COOL
®
coolant. SeeEngine Coolant on
page 5-28.
Hydraulic Brake
SystemDelco
®Supreme 11 Brake Fluid or
equivalent DOT-3 brake uid.
Windshield
WasherOptikleen
®Washer Solvent.
Usage Fluid/Lubricant
Power Steering
SystemGM Power Steering Fluid
(GM Part No. U.S. 89021184,
in Canada 89021186).
Automatic
TransmissionDEXRON
®-VI Automatic
Transmission Fluid.
Key Lock
CylindersMulti-Purpose Lubricant, Superlube
(GM Part No. U.S. 12346241,
in Canada 10953474).
Floor Shift
LinkageLubriplate Lubricant Aerosol
(GM Part No. U.S. 12346293, in
Canada 992723) or lubricant
meeting requirements of NLGI #2
Category LB or GC-LB.
Chassis
LubricationChassis Lubricant (GM Part No.
U.S. 12377985, in Canada
88901242) or lubricant meeting
requirements of NLGI #2, Category
LB or GC-LB.
Front Axle
(1500 Series) -
Four-Wheel
DriveSAE 80W-90 Axle Lubricant
(GM Part No. U.S. 89021671,
in Canada 89021672).
Front Axle
(1500 HD, 1500
AWD, 2500,
2500 HD, and
3500 Series)SAE 75W-90 Synthetic Axle
Lubricant (GM Part No. U.S.
89021677, in Canada 89021678)
meeting GM Specication 9986115.
6-15

Center High-Mounted Stoplamp (CHMSL) and
Cargo Lamp...............................................5-61
Center Seat...................................................1-12
Chains, Tire...................................................5-90
Charging System Light....................................3-43
Check
Engine Light...............................................3-48
Checking Things Under the Hood......................5-12
Chemical Paint Spotting.................................5-120
Child Restraints
Child Restraint Systems...............................1-42
Infants and Young Children...........................1-38
Lower Anchors and Tethers for Children..........1-45
Older Children.............................................1-35
Securing a Child Restraint in a Rear
Seat Position...........................................1-55
Securing a Child Restraint in the Center
Front Seat Position...................................1-57
Securing a Child Restraint in the Right Front
Seat Position...........................1-58, 1-62, 1-66
Where to Put the Restraint...........................1-44
Cigarette Lighter.............................................3-24
Cleaning
Aluminum or Chrome-Plated Wheels.............5-118
Exterior Lamps/Lenses................................5-116
Fabric/Carpet............................................5-114
Finish Care...............................................5-116
Instrument Panel, Vinyl, and Other Plastic
Surfaces...............................................5-115Cleaning (cont.)
Interior.....................................................5-112
Leather....................................................5-114
Tires........................................................5-119
Underbody Maintenance.............................5-119
Washing Your Vehicle.................................5-116
Weatherstrips............................................5-115
Windshield and Wiper Blades......................5-117
Climate Control System...........................3-25, 3-27
Dual Automatic............................................3-28
Outlet Adjustment........................................
3-33
Clock, Setting.................................................3-81
Collision Damage Repair..................................7-11
Compass...............................................2-55, 2-57
Content Theft-Deterrent....................................2-18
Control of a Vehicle.......................................... 4-3
Coolant
Engine Temperature Gage............................3-46
Heater, Engine............................................2-26
Surge Tank Pressure Cap.............................5-30
Cooling System..............................................5-34
Cruise Control................................................3-14
Cruise Control Light........................................3-52
Cupholder(s)..................................................2-75
Customer Assistance Information
Courtesy Transportation.................................. 7-9
Customer Assistance for Text
Telephone (TTY) Users............................... 7-5
Customer Assistance Offices........................... 7-5
3

Electrical System (cont.)
Instrument Panel Fuse Block.......................5-124
Power Windows and Other Power Options....5-123
Underhood Fuse Block...............................5-126
Windshield Wiper Fuses.............................5-123
Engine
Air Cleaner/Filter.........................................5-19
Check and Service Engine Soon Light............3-48
Coolant......................................................5-28
Coolant Heater............................................2-26
Coolant Temperature Gage...........................3-46
Drive Belt Routing.......................................6-18
Engine Compartment Overview......................5-14
Exhaust.....................................................2-53
Fan Noise..................................................5-39
Fast Idle System.........................................2-25
Oil .............................................................5-15
Oil Life System...........................................5-18
Overheated Protection Operating Mode...........5-33
Overheating................................................5-30
Running While Parked..................................2-54
Starting......................................................2-24
Entry Lighting.................................................3-21
Event Data Recorders.....................................7-17
Exit Lighting...................................................3-21
Extender, Safety Belt.......................................1-35
Exterior Lamps...............................................3-17F
Fast Idle System............................................2-25
Filter
Engine Air Cleaner......................................5-19
Finish Damage.............................................5-119
Fixed Mast Antenna.......................................3-126
Flashers, Hazard Warning.................................. 3-8
Flash-to-Pass.................................................3-11
Flat Tire........................................................5-91
Flat Tire, Changing.........................................5-92
Flat Tire, Storing...........................................5-108
Fluid.....................................................5-22, 5-25
Power Steering...........................................5-39
Windshield Washer......................................5-40
Fog Lamp
Fog ...........................................................3-20
Fog Lamp Light..............................................3-52
Four-Wheel Drive....................................2-36, 5-52
Four-Wheel-Drive Light....................................3-53
Front Axle......................................................5-54
Fuel............................................................... 5-6
Additives...................................................... 5-7
California Fuel.............................................. 5-7
E85 (85% Ethanol)........................................ 5-8
Filling a Portable Fuel Container....................5-12
Filling the Tank...........................................5-10
5