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AGMdealermaybeabletodiagnose and repair problems withthe trailer. However, any diagnosisand repair of the trailer is notcovered under the vehicle warranty.Contact your trailer dealer forassistance with trailer repairs andtrailer warranty information.
Trailer Sway
Control (TSC)
Vehicles with StabiliTrak have aTrailer Sway Control (TSC) feature.Trailer sway is unintendedside-to-side motion of a trailer whilebeing towed. If the vehicle is towingatrailerandtheTSCdetectsthatsway is increasing, the vehiclebrakes are selectively applied ateach wheel, to help reduceexcessive trailer sway. If the vehicleis equipped with the IntegratedTrailer Brake Control (ITBC) system,and the trailer has the electricactuated brake system, StabiliTrakmay also apply the trailer brakes.
If TSC is enabled, the TractionControl System (TCS)/StabiliTrakwarning light will flash on theinstrument cluster. Vehicle speedmust be reduced. If trailer swaycontinues, StabiliTrak can reduceengine torque to help slow thevehicle. SeeTr a c t i o n C o n t r o l /Electronic Stability Control0295.
{Warning
Even if the vehicle is equipped
with TSC, trailer sway could result
in loss of control and the vehicle
could crash. If excessive trailer
sway is detected, slow down to a
safe speed. Check the trailer and
vehicle to help correct possible
causes. These could include an
improperly or overloaded trailer,
unrestrained cargo, improper
(Continued)
Warning (Continued)
trailer hitch configuration,
excessive vehicle-trailer speed,
or improperly inflated or incorrect
vehicle or trailer tires. SeeTo w i n g
Equipment0335for trailer ratings
and hitch setup
recommendations.
Adding non-dealer accessories canaffect the vehicle performance.SeeAccessories andModifications0352.
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Driving and Operating 345
Conversions and
Add-Ons
Add-On Electrical
Equipment
{Warning
The Data Link Connector (DLC) is
used for vehicle service and
Emission Inspection/Maintenance
testing. SeeMalfunction Indicator
Lamp (Check Engine Light)
0138.Adeviceconnectedtothe
DLC—such as an aftermarket
fleet or driver-behavior tracking
device—may interfere with
vehicle systems. This could affect
vehicle operation and cause a
crash. Such devices may also
access information stored in the
vehicle’ssystems.
Caution
Some electrical equipment can
damage the vehicle or cause
components to not work and
would not be covered by the
vehicle warranty. Always check
with your dealer before adding
electrical equipment.
Add-on equipment can drain thevehicle's 12-volt battery, even if thevehicle is not operating.
The vehicle has an airbag system.Before attempting to add anythingelectrical to the vehicle, seeServicing the Airbag-EquippedVehicle086andAdding Equipmentto the Airbag-EquippedVehicle087.
For information on wiring auxiliaryswitches, see www.gmupfitter.comor contact your dealer.
Adding a Snow Plow or
Similar Equipment
Caution
Do not exceed 72 km/h (45 mph)
with a snow plow mounted to the
vehicle. The vehicle could
overheat and be damaged.
Before installing a snow plow on thevehicle, follow these guidelines:
Caution
If the vehicle does not have the
snow plow prep package, RPO
VYU, adding a plow can damage
the vehicle, and the repairs would
not be covered by the vehicle
warranty. Unless the vehicle was
built to carry a snow plow, do not
add one to the vehicle. If the
vehicle has RPO VYU, then the
payload the vehicle can carry will
be reduced when a snow plow is
installed. The vehicle can be
(Continued)
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346 Driving and Operating
Caution (Continued)
damaged if either the front or rear
axle ratings or the Gross Vehicle
Weight Rating (GVWR) are
exceeded.
The plow the vehicle can carrydepends on many things, such as:
.The options the vehicle camewith, and the weight of thoseoptions.
.The weight and number ofpassengers to be carried.
.The weight of items added to thevehicle, like a tool box ortruck cap.
.The total weight of anyadditional cargo to be carried.
For example, if the snow plowweighs 318 kg (700 lb), the totalweight of all occupants and cargoinside the cab should not exceed135 kg (300 lb). This means that youmay only be able to carry onepassenger. Even this may be too
much if there is other equipmentalready adding to the weight of thevehicle.
To s a f e l y c a r r y a s n o w p l o w o n t h evehicle:
.Follow all aftermarket snow plowmanufacturer’sinstructionsforthe operation and transportationof the snow plow.
.With a snow plow attached, theengine coolant temperaturegauge may show a highertemperature than while drivingwithout one. The snow plowcould block the airflow to theradiator. This could be morenoticeable as vehicle speedincreases. At speeds above72 km (45 mph), this may causethe engine coolant to overheat.
.To i n c r e a s e t h e a i r f l o w, m o v e t h esnow plow blade postion.
.If driving more than 24 km(15 mi), angle the plow bladeposition.
.Make sure the weight on thefront and rear axles does notexceed the axle rating for each.
.For the front axle, if more cargoor passengers must be carried,appropriate counter ballast mustbe installed rear of the rear axle.Counter ballast must be properlysecured so it will not moveduring driving.
.Rear ballast may be required toensure a proper front and rearweight distribution ratio, eventhough the actual weight at thefront axle may be less than thefront axle rating.
.The snow plow manufacturer orinstaller can assist indetermining the amount of rearballast required, to help makesure the snow plow/vehiclecombination does not exceedthe GVW rating, the front andrear axle ratings, and the frontand rear weight distribution ratio.
.The total vehicle must notexceed the GVW rating.
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Driving and Operating 347
Front axle reserve capacity is thedifference between the Gross AxleWeight Rating (GAWR) and the frontaxle weight of the vehicle with fullfuel and passengers. This is theamount of weight that can be addedto the front axle before reaching thefront GAWR.
United States
Canada
The front axle reserve capacity forthe vehicle is in the lower rightcorner of the Certification/Tire label.
To c a l c u l a t e t h e a m o u n t o f w e i g h tany front accessory, such as a snowplow, is adding to the front axle, usethis formula:
(W x (A + W.B.)) /W.B.= Weight theaccessory is adding to thefront axle.
Where:W=WeightofaddedaccessoryA=Distancethattheaccessoryis in front of the front axleW.B. = Vehicle Wheelbase
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For example, adding a 318 kg(700 lb) snow plow actually addsmore than 318 kg (700 lb) to thefront axle. Using the formula, if thesnow plow is 122 cm (4 ft) in front ofthe front axle and the wheelbase is305 cm (10 ft), then:W=318kg(700lb)A=122cm(4ft)W.B. = 305 cm (10 ft)
(W x (A + W.B.)/W.B. =(318 x (122 + 305))/305 = 445 kg(980 lb)
This means if the front axle reservecapacity is more than 445 kg(980 lb), the snow plow could beadded without exceeding thefront GAWR.
Heavier equipment can be added onthe front of the vehicle if less cargoor fewer passengers are carried,or by positioning cargo toward therear. This reduces the load on thefront. However, the front GAWR,rear GAWR, and Gross VehicleWeight Rating (GVWR) must neverbe exceeded.
{Warning
On some vehicles that have
certain front mounted equipment,
such as a snow plow, it may be
possible to load the front axle to
the front Gross Axle Weight
Rating (GAWR) but not have
enough weight on the rear axle to
have proper braking performance.
If the brakes cannot work
properly, the vehice could crash.
Always follow the snow plow
manufacturer or installer's
recommendation for rear ballast
to ensure a proper front and rear
weight distribution ratio.
Maintaining a proper front and
rear weight distribution ratio is
necessary to provide proper
braking performance.
To t a l v e h i c l e r e s e r v e c a p a c i t y i s t h edifference between the GVWR andthe weight of the truck with full fueland passengers. It is the amount ofweight that can be added to thevehicle before reaching the GVWR.Reserve capacity numbers are
intended as a guide when selectingthe amount of equipment or cargothe truck can carry. If unsure of thevehicle's front, rear, or total weight,go to a weigh station and weigh thevehicle. Your dealer can also helpwith this.
The total vehicle reserve capacityfor the vehicle is in the lower rightcorner of the Certification/Tire labelas shown previously.
See your dealer for additionaladvice and information about usingasnowplowonthevehicle.Also,seeVehicle Load Limits0259.
Emergency Roof Lamp
Provisions
Vehicles with the RPO VYU snowplow prep package also have anemergency roof lamp provisionpackage, RPO TRW. Wiring for theemergency roof lamp is providedabove the overhead console. SeeAuxiliary Roof-Mounted Lamp0176for switch location.
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Driving and Operating 349
Pickup Conversion to
Chassis Cab
We are aware that some vehicleowners might consider having thepickup box removed and acommercial or recreational bodyinstalled. Owners should be awarethat, as manufactured, there aredifferences between a chassis caband a pickup with the box removedwhich could affect vehicle safety.The components necessary to adaptapickuptopermititssafeusewithaspecializedbodyshouldbeinstalled by the body builder.
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350 Vehicle Care
Vehicle Care
General Information
General Information . . . . . . . . . . 351California Proposition65 Warning . . . . . . . . . . . . . . . . . 351California PerchlorateMaterials Requirements . . . . . 352Accessories andModifications . . . . . . . . . . . . . . . . 352
Vehicle Checks
Doing Your OwnService Work . . . . . . . . . . . . . . . 353Hood . . . . . . . . . . . . . . . . . . . . . . . . . 353Engine CompartmentOverview . . . . . . . . . . . . . . . . . . . . 354Engine Oil . . . . . . . . . . . . . . . . . . . . 359Engine Oil Life System . . . . . . . 362Automatic Transmission Fluid(6-Speed Transmission) . . . . . 363Automatic Transmission Fluid(8-Speed Transmission) . . . . . 366Manual Transmission Fluid . . . 366Hydraulic Clutch . . . . . . . . . . . . . . 366Engine Air Cleaner/Filter . . . . . . 367Cooling System . . . . . . . . . . . . . . 368Engine Coolant . . . . . . . . . . . . . . . 369Engine Overheating . . . . . . . . . . 372
Overheated Engine ProtectionOperating Mode . . . . . . . . . . . . . 374Engine Fan . . . . . . . . . . . . . . . . . . . 374Power Steering Fluid (1500Series) . . . . . . . . . . . . . . . . . . . . . . 375Power Steering Fluid (2500/3500 Series) . . . . . . . . . . . . . . . . 375Washer Fluid . . . . . . . . . . . . . . . . . 375Brakes . . . . . . . . . . . . . . . . . . . . . . . 376Brake Fluid . . . . . . . . . . . . . . . . . . . 377Battery - North America . . . . . . 378Four-Wheel Drive . . . . . . . . . . . . . 379Front Axle . . . . . . . . . . . . . . . . . . . . 380Rear Axle . . . . . . . . . . . . . . . . . . . . 380Noise Control System . . . . . . . . 382Starter Switch Check . . . . . . . . . 383Automatic Transmission ShiftLock Control FunctionCheck . . . . . . . . . . . . . . . . . . . . . . . 383Ignition Transmission LockCheck . . . . . . . . . . . . . . . . . . . . . . . 383Park Brake and P (Park)Mechanism Check . . . . . . . . . . 384Wiper Blade Replacement . . . . 384Glass Replacement . . . . . . . . . . 385
Headlamp Aiming
Headlamp Aiming . . . . . . . . . . . . 385
Bulb Replacement
Bulb Replacement . . . . . . . . . . . . 385
Halogen Bulbs . . . . . . . . . . . . . . . . 385High Intensity Discharge (HID)Lighting . . . . . . . . . . . . . . . . . . . . . 386LED Lighting . . . . . . . . . . . . . . . . . 386Headlamps, Front Turn Signal,Sidemarker, and ParkingLamps . . . . . . . . . . . . . . . . . . . . . . 386Fog Lamps . . . . . . . . . . . . . . . . . . . 387Ta i l l a m p s ( C h a s s i s C a bModels) . . . . . . . . . . . . . . . . . . . . . 387Ta i l l a m p s , T u r n S i g n a l ,Stoplamps, and Back-UpLamps . . . . . . . . . . . . . . . . . . . . . . 387Center High-MountedStoplamp (CHMSL) andCargo Lamp . . . . . . . . . . . . . . . . . 389Replacement Bulbs . . . . . . . . . . . 389
Electrical System
High Voltage Devices andWiring . . . . . . . . . . . . . . . . . . . . . . . 389Electrical System Overload . . . 389Fuses . . . . . . . . . . . . . . . . . . . . . . . . 390Engine Compartment FuseBlock . . . . . . . . . . . . . . . . . . . . . . . . 390Instrument Panel Fuse Block(Right) . . . . . . . . . . . . . . . . . . . . . . 393Instrument Panel FuseBlock (Left) . . . . . . . . . . . . . . . . . 395
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Wheels and Tires
Tires . . . . . . . . . . . . . . . . . . . . . . . . . . 397All-Season Tires . . . . . . . . . . . . . . 398Winter Tires . . . . . . . . . . . . . . . . . . 398Low-Profile Tires . . . . . . . . . . . . . 399All-Terrain Tires . . . . . . . . . . . . . . . 399Tire Sidewall Labeling . . . . . . . . 399Tire Designations . . . . . . . . . . . . . 402Tire Terminology andDefinitions . . . . . . . . . . . . . . . . . . 403Tire Pressure . . . . . . . . . . . . . . . . . 405Tire Pressure for High-SpeedOperation . . . . . . . . . . . . . . . . . . . 407Tire Pressure MonitorSystem . . . . . . . . . . . . . . . . . . . . . . 407Tire Pressure MonitorOperation . . . . . . . . . . . . . . . . . . . 408Tire Inspection . . . . . . . . . . . . . . . . 411Tire Rotation . . . . . . . . . . . . . . . . . 412When It Is Time for NewTires . . . . . . . . . . . . . . . . . . . . . . . . 414Buying New Tires . . . . . . . . . . . . . 415Different Size Tires andWheels . . . . . . . . . . . . . . . . . . . . . . 416Uniform Tire QualityGrading . . . . . . . . . . . . . . . . . . . . . 417Wheel Alignment and TireBalance . . . . . . . . . . . . . . . . . . . . . 418Wheel Replacement . . . . . . . . . . 418Tire Chains . . . . . . . . . . . . . . . . . . . 419If a Tire Goes Flat . . . . . . . . . . . . 420
Tire Changing . . . . . . . . . . . . . . . . 422Full-Size Spare Tire . . . . . . . . . . 431
Jump Starting
Jump Starting - NorthAmerica . . . . . . . . . . . . . . . . . . . . . 432
Towing the Vehicle
To w i n g t h e V e h i c l e . . . . . . . . . . . 4 3 6Recreational VehicleTo w i n g . . . . . . . . . . . . . . . . . . . . . . 4 3 7
Appearance Care
Exterior Care . . . . . . . . . . . . . . . . . 441Interior Care . . . . . . . . . . . . . . . . . . 446Floor Mats . . . . . . . . . . . . . . . . . . . . 449
General Information
For service and parts needs, visityour dealer. You will receivegenuine GM parts and GM-trainedand supported service people.
Genuine GM parts have one ofthese marks:
California Proposition
65 Warning
WARNING:Most motor vehicles,including this one, as well as manyof its service parts and fluids,contain and/or emit chemicalsknown to the State of California to