2015 Chevrolet Silverado Owners Manual

Black plate (97,1)

Driving and Operating

9-97

The Trailer Brake Control Panel is used along with the Trailer Brake Display Page on the Driver Information Center (DIC) to adjust and display power output to the trailer brakes.

Trailer Brake DIC Display Page The ITBC system displays messages in the DIC. The display page indicates Trailer Gain setting, power output to the trailer brakes, trailer connection, and system operational status. To display the Trailer Brake Display Page, do any of the following: . Scroll through the DIC menu

pages.

. Press a Trailer Gain button.

If the Trailer Brake Display Page is not currently displayed, press a Trailer Gain button to recall the current Trailer Gain setting. Each press and release of the gain buttons will then change the Trailer Gain setting.

. Activate the Manual Trailer

Brake Apply Lever.

TRAILER GAIN: This setting can be adjusted from 0.0 to 10.0 with either a trailer connected or disconnected. To adjust the Trailer Gain, press one of the Trailer Gain Adjustment buttons. Press and hold a gain button to continuously adjust the Trailer Gain. To turn the output to the trailer off, adjust the Trailer Gain setting to 0.0 (zero). TRAILER OUTPUT: This displays anytime a trailer with electric brakes is connected. Output to the trailer brakes is based on the amount of vehicle braking present and relative to the Trailer Gain setting. Output is displayed from 0 to 100% for each gain setting. The Trailer Output will indicate “- - - - - -” on the Trailer Brake Display Page whenever the following occur: . No trailer is connected.

. A trailer without electric brakes is connected (no DIC message will display).

. A trailer with electric brakes has

become disconnected (a CHECK TRAILER WIRING message will also display on the DIC). There is a fault present in the wiring to the trailer brakes (a CHECK TRAILER WIRING message will also display on the DIC). The ITBC system is not working due to a fault (a SERVICE TRAILER BRAKE SYSTEM message will also display in the DIC).

Manual Trailer Brake Apply The Manual Trailer Brake Apply Lever is used to apply the trailer’s electric brakes independent of the vehicle’s brakes. Sliding the lever to the left will apply only the trailer brakes. Use this lever to adjust Trailer Gain to properly adjust the power output to the trailer brakes.

Chevrolet 2015i Silverado Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-8425172) - 2015 - CRC - 6/20/14

Black plate (98,1)

9-98

Driving and Operating

The trailer's and the vehicle's brake lamps will come on when either vehicle brakes or manual trailer brakes are applied.

Trailer Gain Adjustment Procedure Trailer Gain should be set for a specific trailering condition and must be adjusted anytime vehicle loading, trailer loading, or road surface conditions change.

{ Warning Trailer brakes that are over-gained or under-gained may not stop the vehicle and the trailer as intended and can result in a crash. Always follow the instructions to set the Trailer Gain for the proper trailer stopping performance.

Use the following to adjust Trailer Gain for each towing condition: 1. Drive the vehicle with the trailer attached on a level road surface representative of the towing condition and free of traffic at about 32 to 40 km/h (20 to 25 mph) and fully apply the Manual Trailer Brake Apply Lever. Adjusting Trailer Gain at speeds lower than 32 to 40 km/h (20 to 25 mph) may result in an incorrect gain setting.

2. Adjust the Trailer Gain, using the Trailer Gain Adjustment Buttons, to just below the point of trailer wheel lock-up, indicated by trailer wheel squeal or tire smoke when a trailer wheel locks. Trailer wheel lock-up may not occur if towing a heavily loaded trailer. In this case, adjust the Trailer Gain to the highest allowable setting for the towing condition.

3. Readjust Trailer Gain anytime vehicle loading, trailer loading, or road surface conditions change or if trailer wheel lock-up is noticed at any time while towing.

Other ITBC-Related DIC Messages In addition to displaying TRAILER GAIN and OUTPUT through the DIC, trailer connection and ITBC system status are displayed on the DIC. TRAILER CONNECTED: This message will briefly display when a trailer with electric brakes is first connected to the vehicle. This message will automatically turn off in about 10 seconds. This message can be acknowledged before it automatically turns off.

Chevrolet 2015i Silverado Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-8425172) - 2015 - CRC - 6/20/14

Black plate (99,1)

CHECK TRAILER WIRING: This message will display if:

The ITBC system first determines connection to a trailer with electric brakes and then the trailer harness becomes disconnected from the vehicle. If the disconnect occurs while the vehicle is stationary, this message will automatically turn off in about 30 seconds. This message will also turn off if it is acknowledged or if the trailer harness is reconnected. If the disconnect occurs while the vehicle is moving, this message will continue until the ignition is turned off. This message will also turn off if it is acknowledged or if the trailer harness is reconnected. There is an electrical fault in the wiring to the trailer brakes. This message will continue as long as there is an electrical fault in

the trailer wiring. This message will also turn off if it is acknowledged.

To determine if the electrical fault is on the vehicle side or trailer side of the trailer wiring harness connection: 1. Disconnect the trailer wiring

harness from the vehicle.

2. Turn the ignition off. 3. Wait 10 seconds, then turn the

4.

ignition back to RUN. If the CHECK TRAILER WIRING message reappears, the electrical fault is on the vehicle side. If the CHECK TRAILER WIRING message only reappears when connecting the trailer wiring harness to the vehicle, the electrical fault is on the trailer side.

SERVICE TRAILER BRAKE SYSTEM: This message will display when there is a problem with the ITBC system. If this message

Driving and Operating

9-99

continues over multiple ignition cycles, there is a problem with the ITBC system. Have the vehicle serviced. If either the CHECK TRAILER WIRING or SERVICE TRAILER BRAKE SYSTEM message displays while driving, the ITBC system may not be fully functional or may not function at all. When traffic conditions allow, carefully pull the vehicle over to the side of the road and turn the ignition off. Check the wiring connection to the trailer and turn the ignition back on. If either of these messages continues, either the vehicle or trailer needs service. A GM dealer may be able to diagnose and repair problems with the trailer. However, any diagnosis and repair of the trailer is not covered under the vehicle warranty. Contact your trailer dealer for assistance with trailer repairs and trailer warranty information.

Chevrolet 2015i Silverado Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-8425172) - 2015 - CRC - 6/20/14

Black plate (100,1)

9-100

Driving and Operating

Trailer Sway Control (TSC) Vehicles with StabiliTrak have a TSC feature. Trailer sway is unintended side-to-side motion of a trailer while being towed. If the vehicle is towing a trailer and the TSC detects that sway is increasing, the vehicle brakes are selectively applied at each wheel, to help reduce excessive trailer sway. If the vehicle is equipped with the Integrated Trailer Brake Control (ITBC) system, and the trailer has the electric actuated brake system, StabiliTrak may also apply the trailer brakes. If TSC is enabled, the Traction Control System (TCS)/StabiliTrak warning light will flash on the instrument cluster. Vehicle speed must be reduced. If trailer sway continues, StabiliTrak can reduce engine torque to help slow the vehicle. See Traction Control/ Electronic Stability Control on page 9-54.

{ 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 trailer hitch configuration, excessive vehicle-trailer speed, or improperly inflated or incorrect vehicle or trailer tires. See Towing Equipment on page 9-90 for trailer ratings and hitch setup recommendations.

Adding non-dealer accessories can affect the vehicle performance. See Accessories and Modifications on page 10-3.

Conversions and Add-Ons

Add-On Electrical Equipment

{ Caution

Some electrical equipment can damage the vehicle or cause components to not work and would not be covered by the warranty. Always check with your dealer before adding electrical equipment.

Add-on equipment can drain the vehicle's 12-volt battery, even if the vehicle is not operating. The vehicle has an airbag system. Before attempting to add anything electrical to the vehicle, see Servicing the Airbag-Equipped Vehicle on page 3-34 and Adding Equipment to the Airbag-Equipped Vehicle on page 3-34.

Chevrolet 2015i Silverado Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-8425172) - 2015 - CRC - 6/20/14

Black plate (101,1)

Driving and Operating

9-101

Caution (Continued)

vehicle was built to carry a snow plow, do not add one to the vehicle. If the vehicle has the snow plow prep package, called RPO VYU, then the payload the vehicle can carry will be reduced when a snow plow is installed. The vehicle can be damaged if either the front or rear axle ratings or the Gross Vehicle Weight Rating (GVWR) are exceeded.

Some vehicles are built with a special snow plow prep package, called RPO VYU. If the vehicle has this option, you can add a plow to it, provided certain weights, such as the weights on the vehicle's axles and the Gross Vehicle Weight Rating (GVWR), are not exceeded.

The plow the vehicle can carry depends on many things, such as:

The options the vehicle came with, and the weight of those options. The weight and number of passengers intended to be carried. The weight of items added to the vehicle, like a tool box or truck cap. The total weight of any additional cargo intended to be carried.

Say, for example, you have a 318 kg (700 lb) snow plow. The total weight of all occupants and cargo inside the cab should not exceed 135 kg (300 lb). This means that you may only be able to carry one passenger. But, even this may be too much if there is other equipment already adding to the weight of the vehicle.

For information on wiring auxiliary switches, see www.gmupfitter.com or contact your dealer.

Adding a Snow Plow or Similar Equipment { Caution

Do not exceed 64 km/h (40 mph) with a snow plow mounted to the vehicle. The vehicle could overheat and be damaged.

Before installing a snow plow on the vehicle, here are some things you need to know:

{ Caution

If the vehicle does not have the snow plow prep package, adding a plow can damage the vehicle, and the repairs would not be covered by warranty. Unless the

(Continued)

Chevrolet 2015i Silverado Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-8425172) - 2015 - CRC - 6/20/14

Black plate (102,1)

9-102

Driving and Operating

Here are some guidelines for safely carrying a snow plow on the vehicle: . Make sure the weight on the front and rear axles does not exceed the axle rating for each. For the front axle, if more cargo or passengers must be carried, appropriate counter ballast must be installed rear of the rear axle. Counter ballast must be properly secured so it will not move during driving. Follow the snow plow manufacturer's recommendations regarding rear ballast. Rear ballast may be required to ensure a proper front and rear weight distribution ratio, even though the actual weight at the front axle may be less than the front axle rating. The snow plow manufacturer or installer can assist you in determining the amount of rear ballast required, to help make sure the snow plow/vehicle combination does not exceed

the GVW rating, the front and rear axle ratings, and the front and rear weight distribution ratio. The total vehicle must not exceed the GVW rating.

Front axle reserve capacity is the difference between the Gross Axle Weight Rating (GAWR) and the front axle weight of the vehicle with full fuel and passengers. Basically, it is the amount of weight that can be added to the front axle before reaching the front GAWR.

United States

Canada

The front axle reserve capacity for the vehicle can be found in the lower right corner of the Certification/Tire label, as shown.

Chevrolet 2015i Silverado Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-8425172) - 2015 - CRC - 6/20/14

Black plate (103,1)

In order to calculate the amount of weight any front accessory, such as a snow plow, is adding to the front axle, use the following formula:

(W x (A + W.B.)) /W.B.= Weight the accessory is adding to the front axle. Where:

W = Weight of added accessory A = Distance that the accessory is in front of the front axle W.B. = Vehicle Wheelbase

Driving and Operating

9-103

For example, adding a 318 kg (700 lb) snow plow actually adds more than 318 kg (700 lb) to the front axle. Using the formula, if the snow plow is 122 cm (4 ft) in front of the front axle and the wheel base is 305 cm (10 ft), then:

W = 318 kg (700 lb) A = 122 cm (4 ft) W.B. = 305 cm (10 ft)

(W x (A + W.B.)/W.B. = (318 x (122 + 305))/305 = 445 kg (980 lb) So, if the front axle reserve capacity is more than 445 kg (980 lb), the snow plow could be added without exceeding the front GAWR. Heavier equipment can be added on the front of the vehicle if it is compensated for by carrying fewer passengers or less cargo, or by positioning cargo toward the rear. This has the effect of reducing the load on the front. However, the front GAWR, rear GAWR, and Gross Vehicle Weight Rating (GVWR) must never be 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, you could have a crash. To help the brakes work properly when a snow plow is installed, always follow the snow plow manufacturer or installer's recommendation for rear ballast to ensure a proper front and rear weight distribution ratio, even though the actual front weight may be less than the front GAWR, and the total vehicle weight is less than the gross vehicle weight rating (GVWR). Maintaining a proper front and

(Continued)

Chevrolet 2015i Silverado Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-8425172) - 2015 - CRC - 6/20/14

Black plate (104,1)

9-104

Driving and Operating

Warning (Continued)

rear weight distribution ratio is necessary to provide proper braking performance.

Total vehicle reserve capacity is the difference between the GVWR and the weight of the truck with full fuel and passengers. It is the amount of weight that can be added to the vehicle before reaching the GVWR. Keep in mind that reserve capacity numbers are intended as a guide when selecting the amount of equipment or cargo the truck can carry. If unsure of the vehicle's front, rear, or total weight, go to a weigh station and weigh the vehicle. Your dealer can also help with this.

The total vehicle reserve capacity for the vehicle can be found in the lower right corner of the Certification/Tire label as shown previously. See your dealer for additional advice and information about using a snow plow on the vehicle. Also, see Vehicle Load Limits on page 9-15. Emergency Roof Lamp Provisions Vehicles with the RPO VYU snow plow prep package also have an emergency roof lamp provision package, RPO TRW. Wiring for the emergency roof lamp is provided above the overhead console. See Auxiliary Roof-Mounted Lamp on page 6-5 for switch location.

Pickup Conversion to Chassis Cab We are aware that some vehicle owners might consider having the pickup box removed and a commercial or recreational body installed. Owners should be aware that, as manufactured, there are differences between a chassis cab and a pickup with the box removed which could affect vehicle safety. The components necessary to adapt a pickup to permit its safe use with a specialized body should be installed by the body builder.

Chevrolet 2015i Silverado Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-8425172) - 2015 - CRC - 6/20/14

Black plate (1,1)

Vehicle Care

10-1

Vehicle Care

General Information

General Information . . . . . . . . . . 10-3
California Proposition

65 Warning . . . . . . . . . . . . . . . . . 10-3

California Perchlorate

Materials Requirements . . . . 10-3

Accessories and

Modifications . . . . . . . . . . . . . . . 10-3

Vehicle Checks Doing Your Own

Service Work . . . . . . . . . . . . . . . 10-4
Hood . . . . . . . . . . . . . . . . . . . . . . . . 10-5
Engine Compartment

Overview . . . . . . . . . . . . . . . . . . . 10-6
Engine Oil . . . . . . . . . . . . . . . . . . 10-11
Engine Oil Life System . . . . . 10-14
Automatic Transmission

Fluid (6 Speed Transmission) . . . . . . . . . . . . . 10-15

Automatic Transmission

Fluid (8 Speed Transmission) . . . . . . . . . . . . . 10-18

Manual Transmission

Fluid . . . . . . . . . . . . . . . . . . . . . . 10-19

Hydraulic Clutch . . . . . . . . . . . . 10-19
Engine Air Cleaner/Filter . . . . 10-19
Cooling System . . . . . . . . . . . . 10-21
Engine Coolant . . . . . . . . . . . . . 10-22
Engine Overheating . . . . . . . . 10-25
Overheated Engine

Protection Operating Mode . . . . . . . . . . . 10-27
Engine Fan . . . . . . . . . . . . . . . . . 10-27
Power Steering Fluid

(1500 Series) . . . . . . . . . . . . . 10-28

Power Steering Fluid

(2500/3500 Series) . . . . . . . . 10-28
Washer Fluid . . . . . . . . . . . . . . . 10-29
Brakes . . . . . . . . . . . . . . . . . . . . . 10-30
Brake Fluid . . . . . . . . . . . . . . . . . 10-31
Battery . . . . . . . . . . . . . . . . . . . . . 10-32
Four-Wheel Drive . . . . . . . . . . . 10-33
Front Axle . . . . . . . . . . . . . . . . . . 10-34
Rear Axle . . . . . . . . . . . . . . . . . . 10-35
Noise Control System . . . . . . 10-36
Starter Switch Check . . . . . . . 10-37
Automatic Transmission Shift

Lock Control Function Check . . . . . . . . . . . . . . . . . . . . . 10-37

Ignition Transmission Lock

Check . . . . . . . . . . . . . . . . . . . . . 10-38

Park Brake and P (Park)

Mechanism Check . . . . . . . . 10-38

Wiper Blade

Replacement . . . . . . . . . . . . . . 10-38
Glass Replacement . . . . . . . . 10-39

Headlamp Aiming

Headlamp Aiming . . . . . . . . . . 10-39

Bulb Replacement

Bulb Replacement . . . . . . . . . . 10-40
Halogen Bulbs . . . . . . . . . . . . . . 10-40
Headlamps, Front Turn

Signal, Sidemarker, and Parking Lamps . . . . . . . . . . . . 10-40
Fog Lamps . . . . . . . . . . . . . . . . . 10-41
Taillamps (Chassis Cab

Models) . . . . . . . . . . . . . . . . . . . 10-41

Taillamps, Turn Signal,

Stoplamps, and Back-Up Lamps . . . . . . . . . . . . . . . . . . . . 10-41

Center High-Mounted

Stoplamp (CHMSL) and Cargo Lamp . . . . . . . . . . . . . . 10-43
Replacement Bulbs . . . . . . . . . 10-43

Chevrolet 2015i Silverado Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-8425172) - 2015 - CRC - 6/20/14

Black plate (2,1)

Towing the Vehicle

Towing the Vehicle . . . . . . . . . 10-95
Recreational Vehicle

Towing . . . . . . . . . . . . . . . . . . . . 10-95

Appearance Care

Exterior Care . . . . . . . . . . . . . . 10-100
Interior Care . . . . . . . . . . . . . . . 10-105
Floor Mats . . . . . . . . . . . . . . . . 10-109

10-2

Vehicle Care

Electrical System

Electrical System

Overload . . . . . . . . . . . . . . . . . . 10-44
Fuses . . . . . . . . . . . . . . . . . . . . . . 10-44
Engine Compartment Fuse

Block . . . . . . . . . . . . . . . . . . . . . 10-45

Instrument Panel Fuse

Block (Left) . . . . . . . . . . . . . . . 10-49

Instrument Panel Fuse Block

(Right) . . . . . . . . . . . . . . . . . . . . 10-51

Wheels and Tires

Tires . . . . . . . . . . . . . . . . . . . . . . . . 10-53
All-Season Tires . . . . . . . . . . . . 10-54
Winter Tires . . . . . . . . . . . . . . . . 10-55
Low-Profile Tires . . . . . . . . . . . 10-55
All-Terrain Tires . . . . . . . . . . . . 10-55
Tire Sidewall Labeling . . . . . . 10-56
Tire Designations . . . . . . . . . . . 10-58
Tire Terminology and

Definitions . . . . . . . . . . . . . . . . 10-60
Tire Pressure . . . . . . . . . . . . . . . 10-62
Tire Pressure for High-Speed

Operation . . . . . . . . . . . . . . . . . 10-64

Tire Pressure Monitor

System . . . . . . . . . . . . . . . . . . . 10-64

Tire Pressure Monitor

Operation . . . . . . . . . . . . . . . . . 10-65
Tire Inspection . . . . . . . . . . . . . . 10-69
Tire Rotation . . . . . . . . . . . . . . . 10-69
Dual Tire Rotation . . . . . . . . . . 10-71
When It Is Time for New

Tires . . . . . . . . . . . . . . . . . . . . . . 10-72
Buying New Tires . . . . . . . . . . . 10-73
Different Size Tires and

Wheels . . . . . . . . . . . . . . . . . . . 10-74

Uniform Tire Quality

Grading . . . . . . . . . . . . . . . . . . . 10-75

Wheel Alignment and Tire

Balance . . . . . . . . . . . . . . . . . . . 10-76
Wheel Replacement . . . . . . . . 10-77
Tire Chains . . . . . . . . . . . . . . . . . 10-78
If a Tire Goes Flat . . . . . . . . . . 10-79
Tire Changing . . . . . . . . . . . . . . 10-80
Full-Size Spare Tire . . . . . . . . 10-90

Jump Starting

Jump Starting . . . . . . . . . . . . . . 10-91

Chevrolet 2015i Silverado Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-8425172) - 2015 - CRC - 6/20/14

Black plate (3,1)

General Information For service and parts needs, visit your dealer. You will receive genuine GM parts and GM-trained and supported service people. Genuine GM parts have one of these marks:

California Proposition 65 Warning Most motor vehicles, including this one, contain and/or emit chemicals known to the State of California to

cause cancer and birth defects or other reproductive harm. Engine exhaust, many parts and systems, many fluids, and some component wear by-products contain and/or emit these chemicals.

California Perchlorate Materials Requirements Certain types of automotive applications, such as airbag initiators, safety belt pretensioners, and lithium batteries contained in Remote Keyless Entry transmitters, may contain perchlorate materials. Special handling may be necessary. For additional information, see www.dtsc.ca.gov/hazardouswaste/ perchlorate.

Accessories and Modifications Adding non‐dealer accessories or making modifications to the vehicle can affect vehicle performance and safety, including such things as airbags, braking, stability, ride and

Vehicle Care

10-3

handling, emissions systems, aerodynamics, durability, and electronic systems like antilock brakes, traction control, and stability control. These accessories or modifications could even cause malfunction or damage not covered by the vehicle warranty. Damage to vehicle components resulting from modifications or the installation or use of non‐GM certified parts, including control module or software modifications, is not covered under the terms of the vehicle warranty and may affect remaining warranty coverage for affected parts. GM Accessories are designed to complement and function with other systems on the vehicle. See your dealer to accessorize the vehicle using genuine GM Accessories installed by a dealer technician. Also, see Adding Equipment to the Airbag-Equipped Vehicle on page 3-34.

Chevrolet 2015i Silverado Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-8425172) - 2015 - CRC - 6/20/14

Black plate (4,1)

10-4

Vehicle Care

Vehicle Checks

Doing Your Own Service Work

{ Warning

It can be dangerous to work on your vehicle if you do not have the proper knowledge, service manual, tools, or parts. Always follow owner manual procedures and consult the service manual for your vehicle before doing any service work.

If doing some of your own service work, use the proper service manual. It tells you much more about how to service the vehicle than this manual can. To order the proper service manual, see Service Publications Ordering Information on page 13-11. This vehicle has an airbag system. Before attempting to do your own service work, see Servicing the Airbag-Equipped Vehicle on page 3-34.

Keep a record with all parts receipts and list the mileage and the date of any service work performed. See Maintenance Records on page 11-16.

{ Caution Even small amounts of contamination can cause damage to vehicle systems. Do not allow contaminants to contact the fluids, reservoir caps, or dipsticks.

Chevrolet 2015i Silverado Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-8425172) - 2015 - CRC - 6/20/14

Black plate (5,1)

Vehicle Care

10-5

Before closing the hood, be sure all the filler caps are on properly. Then bring the hood from full open to within 15 cm (6 in) from the closed position, pause, and push the front center of the hood with a swift, firm motion to fully close the hood.

Hood To open the hood:

1. Pull the handle with this symbol

on it. It is inside the vehicle under the steering wheel.

2. Go to the front of the vehicle to

find the secondary hood release. The handle is under the front edge of the hood near the center. Push the handle to the right and at the same time raise the hood.

Chevrolet 2015i Silverado Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-8425172) - 2015 - CRC - 6/20/14

Black plate (6,1)

10-6

Vehicle Care

Engine Compartment Overview

4.3L V6 Engine

Chevrolet 2015i Silverado Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-8425172) - 2015 - CRC - 6/20/14

Black plate (7,1)

1. Positive (+) Terminal. See Jump

6. Remote Negative (–) Location.

11. Windshield Washer Fluid

Vehicle Care

10-7

Starting on page 10-91. 2. Battery on page 10-32. 3. Coolant Surge Tank and

Pressure Cap. See Cooling System on page 10-21.

4. Engine Air Cleaner/Filter on

page 10-19.

5. Automatic Transmission Dipstick

(If Equipped). See “How to Check Automatic Transmission Fluid” under Automatic Transmission Fluid (6 Speed Transmission) on page 10-15 or Automatic Transmission Fluid (8
Speed Transmission) on page 10-18.

See Jump Starting on page 10-91.

7. Engine Cooling Fans (Out of

View). See Cooling System on page 10-21.

8. Engine Oil Fill Cap. See “When to Add Engine Oil” under Engine Oil on page 10-11.

9. Engine Oil Dipstick. See

“Checking Engine Oil” under Engine Oil on page 10-11.

10. Brake Fluid Reservoir. See Brake Fluid on page 10-31.

Reservoir. See “Adding Washer Fluid” under Washer Fluid on page 10-29.

12. Clutch Fluid Reservoir (If Equipped). See Hydraulic Clutch on page 10-19.

13. Engine Compartment Fuse

Block on page 10-45.

Chevrolet 2015i Silverado Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-8425172) - 2015 - CRC - 6/20/14

Black plate (8,1)

10-8

Vehicle Care

5.3L V8 Engine Shown, 6.2L V8 Engine Similar

Chevrolet 2015i Silverado Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-8425172) - 2015 - CRC - 6/20/14

Black plate (9,1)

1. Positive (+) Terminal. See Jump

6. Remote Negative (–) Location

10. Windshield Washer Fluid

Vehicle Care

10-9

(Out of View). See Jump Starting on page 10-91.

7. Engine Cooling Fans (Out of

View). See Cooling System on page 10-21.

8. Engine Oil Fill Cap. See “When to Add Engine Oil” under Engine Oil on page 10-11.

9. Engine Oil Dipstick. See

“Checking Engine Oil” under Engine Oil on page 10-11.

Reservoir. See “Adding Washer Fluid” under Washer Fluid on page 10-29.

11. Brake Fluid Reservoir. See Brake Fluid on page 10-31. 12. Engine Compartment Fuse

Block on page 10-45.

Starting on page 10-91. 2. Battery on page 10-32. 3. Coolant Surge Tank and

Pressure Cap. See Cooling System on page 10-21.

4. Engine Air Cleaner/Filter on

page 10-19.

5. Automatic Transmission Dipstick

(If Equipped). See “How to Check Automatic Transmission Fluid” under Automatic Transmission Fluid (6 Speed Transmission) on page 10-15 or Automatic Transmission Fluid (8
Speed Transmission) on page 10-18.

Chevrolet 2015i Silverado Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-8425172) - 2015 - CRC - 6/20/14

Black plate (10,1)

10-10

Vehicle Care

6.0L V8 Engine

Chevrolet 2015i Silverado Owner Manual (GMNA-Localizing-U.S./Canada/ Mexico-8425172) - 2015 - CRC - 6/20/14

Black plate (11,1)

1. Positive (+) Terminal. See Jump

9. Remote Negative (–) Location.

Starting on page 10-91. 2. Battery on page 10-32. 3. Coolant Surge Tank and

Pressure Cap. See Cooling System on page 10-21.

4. Engine Air Cleaner/Filter on

page 10-19.

5. Automatic Transmission Dipstick

(If Equipped). See “How to Check Automatic Transmission Fluid” under Automatic Transmission Fluid (6 Speed Transmission) on page 10-15 or Automatic Transmission Fluid (8
Speed Transmission) on page 10-18.

6. Engine Oil Dipstick. See

“Checking Engine Oil” under Engine Oil on page 10-11.

7. Engine Oil Fill Cap. See “When to Add Engine Oil” under Engine Oil on page 10-11.

8. Engine Cooling Fan (Out of

View). See Cooling System on page 10-21.

See Jump Starting on page 10-91.

10. Power Steering Fluid

Reservoir. See Power Steering Fluid (1500 Series) on page 10-28 or Power Steering Fluid (2500/3500 Series) on page 10-28.

11. Windshield Washer Fluid

Reservoir. See “Adding Washer Fluid” under Washer Fluid on page 10-29.

12. Brake Fluid Reservoir. See Brake Fluid on page 10-31.

13. Auxiliary Battery (If Equipped).

See Battery on page 10-32. 14. Engine Compartment Fuse

Block on page 10-45.

If the vehicle has a diesel engine and/or an Allison Transmission, see the Duramax diesel supplement.

Vehicle Care

10-11

Engine Oil For diesel engine vehicles, see “Engine Oil” in the Duramax diesel supplement. To ensure proper engine performance and long life, careful attention must be paid to engine oil. Following these simple, but important steps will help protect your investment: . Always use engine oil approved to the proper specification and of the proper viscosity grade. See “Selecting the Right Engine Oil” in this section.

. Check the engine oil level regularly and maintain the proper oil level. See “Checking Engine Oil” and “When to Add Engine Oil” in this section.

. Change the engine oil at the

appropriate time. See Engine Oil Life System on page 10-14. . Always dispose of engine oil

properly. See “What to Do with Used Oil” in this section.

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10-12

Vehicle Care

Checking Engine Oil It is a good idea to check the engine oil level at each fuel fill. In order to get an accurate reading, the vehicle must be on level ground. The engine oil dipstick handle is a loop. See Engine Compartment Overview on page 10-6 for the location of the engine oil dipstick. If a low oil message displays on the DIC, it is important to park on level ground to accurately measure the oil level on the dipstick. Idling the vehicle on steep grades for a long time can influence the level sensing accuracy. Obtaining an accurate oil level reading is essential: 1.

If the engine has been running recently, turn off the engine and allow several minutes for the oil to drain back into the oil pan. Checking the oil level too soon after engine shutoff will not provide an accurate oil level reading.

{ Warning

The engine oil dipstick handle may be hot; it could burn you. Use a towel or glove to touch the dipstick handle.

2. Pull out the dipstick and wipe it

with a clean paper towel or cloth, then push it back in all the way. Remove it again, keeping the tip down, and check the level.

When to Add Engine Oil

If the oil is below the cross-hatched area at the tip of the dipstick, add 1 L (1 qt) of the recommended oil and then recheck the level. See “Selecting the Right Engine Oil” in this section for an explanation of

what kind of oil to use. For engine oil crankcase capacity, see Capacities and Specifications on page 12-2.

{ Caution

Do not add too much oil. Oil levels above or below the acceptable operating range shown on the dipstick are harmful to the engine. If you find that you have an oil level above the operating range, i.e., the engine has so much oil that the oil level gets above the cross-hatched area that shows the proper operating range, the engine could be damaged. You should drain out the excess oil or limit driving of the vehicle and seek a service professional to remove the excess amount of oil.

See Engine Compartment Overview on page 10-6 for the location of the engine oil fill cap.

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Add enough oil to put the level somewhere in the proper operating range. Push the dipstick all the way back in when through. Selecting the Right Engine Oil Selecting the right engine oil depends on both the proper oil specification and viscosity grade. See Recommended Fluids and Lubricants on page 11-12.

Specification Use and ask for licensed engine oils with the dexos1® approved certification mark. Engine oils meeting the requirements for the vehicle should have the dexos1
approved certification mark. This certification mark indicates that the oil has been approved to the dexos1
specification. See www.gmdexos.com.

{ Caution

Failure to use the recommended engine oil can result in engine damage not covered by the vehicle warranty. Check with your dealer or service provider on whether the oil is approved to the dexos1 specification.

Viscosity Grade Use SAE 0W-20 viscosity grade for the 5.3L and 6.2L V8 engines. Use SAE 5W-30 viscosity grade for the 4.3L V6, and 6.0L V8 engines. Cold Temperature Operation: In an area of extreme cold, where the temperature falls below −29°C (−20°F), an SAE 0W-30 oil may be used in the 4.3L or 6.0L engine.

Vehicle Care

10-13

An oil of this viscosity grade will provide easier cold starting for the engine at extremely low temperatures. When selecting an oil of the appropriate viscosity grade, always select an oil of the correct specification. See “Specification” earlier in this section for more information. Engine Oil Additives/Engine Oil Flushes Do not add anything to the oil. The recommended oils with the dexos specification and displaying the dexos certification mark are all that is needed for good performance and engine protection. Engine oil system flushes are not recommended and could cause engine damage not covered by the vehicle warranty.

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10-14

Vehicle Care

What to Do with Used Oil Used engine oil contains certain elements that can be unhealthy for your skin and could even cause cancer. Do not let used oil stay on your skin for very long. Clean your skin and nails with soap and water, or a good hand cleaner. Wash or properly dispose of clothing or rags containing used engine oil. See the manufacturer's warnings about the use and disposal of oil products. Used oil can be a threat to the environment. If you change your own oil, be sure to drain all the oil from the filter before disposal. Never dispose of oil by putting it in the trash or pouring it on the ground, into sewers, or into streams or bodies of water. Recycle it by taking it to a place that collects used oil.

engine oil and filter must be changed at least once a year and, at this time, the system must be reset. For vehicles without the CHANGE ENGINE OIL SOON message, an oil change is needed when the OIL LIFE REMAINING percentage is near 0%. Your dealer has trained service people who will perform this work and reset the system. It is also important to check the oil regularly over the course of an oil drain interval and keep it at the proper level. If the system is ever reset accidentally, the oil must be changed at 5 000 km (3,000 mi) since the last oil change. Remember to reset the oil life system whenever the oil is changed.

Engine Oil Life System

When to Change Engine Oil This vehicle has a computer system that indicates when to change the engine oil and filter. This is based on a combination of factors which include engine revolutions, engine temperature, and miles driven. Based on driving conditions, the mileage at which an oil change is indicated can vary considerably. For the oil life system to work properly, the system must be reset every time the oil is changed. On some vehicles, when the system has calculated that oil life has been diminished, a CHANGE ENGINE OIL SOON message comes on to indicate that an oil change is necessary. See Engine Oil Messages on page 5-38. Change the oil as soon as possible within the next 1 000 km (600 mi). It is possible that, if driving under the best conditions, the oil life system might indicate that an oil change is not necessary for up to a year. The

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The oil life system can also be reset as follows: 1. Turn the ignition to ON/RUN with

the engine off.

2. Fully press the accelerator pedal

slowly three times within five seconds.

3. Display the OIL LIFE

REMAINING on the DIC. If the display shows 100%, the system is reset.

If the vehicle has a CHANGE ENGINE OIL SOON message and it comes back on when the vehicle is started and/or the OIL LIFE REMAINING is near 0%, the engine oil life system has not been reset. Repeat the procedure.

Vehicle Care

10-15

Automatic Transmission Fluid (6 Speed Transmission)

When to Check and Change Automatic Transmission Fluid It is usually not necessary to check the transmission fluid level. The only reason for fluid loss is a transmission leak or overheated transmission. If a small leak is suspected, then use the following checking procedures to check the fluid level. However, if there is a large leak, then it may be necessary to have the vehicle towed to a dealer service department and have it repaired before driving the vehicle further.

How to Reset the Engine Oil Life System Reset the system whenever the engine oil is changed so that the system can calculate the next engine oil change. Always reset the engine oil life to 100% after every oil change. It will not reset itself. To reset the engine oil life system: 1. Display the OIL LIFE

REMAINING on the DIC. If the vehicle does not have DIC buttons, the vehicle must be in P (Park) to access this display. See Driver Information Center (DIC) (Base Level) on page 5-30
or Driver Information Center (DIC) (Uplevel) on page 5-32.

2. Press and hold V, or the trip

odometer reset stem if the vehicle does not have DIC buttons, for several seconds. The oil life will change to 100%.

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10-16

Vehicle Care

{ Caution

How to Check Automatic Transmission Fluid

Use of the incorrect automatic transmission fluid may damage the vehicle, and the damage may not be covered by the vehicle warranty. Always use the automatic transmission fluid listed in Recommended Fluids and Lubricants on page 11-12.

Change the fluid and filter at the scheduled maintenance intervals listed in Maintenance Schedule on page 11-3. Be sure to use the transmission fluid listed in Recommended Fluids and Lubricants on page 11-12.

{ Caution

Too much or too little fluid can damage the transmission. Too much can mean that some of the fluid could come out and fall on hot engine parts or exhaust system parts, starting a fire. Too little fluid could cause the transmission to overheat. Be sure to get an accurate reading if checking the transmission fluid.

Before checking the fluid level, prepare the vehicle: 1. Start the engine and park the

vehicle on a level surface. Keep the engine running.

2. Apply the parking brake and

place the shift lever in P (Park).

3. With your foot on the brake pedal, move the shift lever through each gear range,

pausing for about three seconds in each range. Then, move the shift lever back to P (Park).

4. Allow the engine to idle (500–

800 rpm) for at least one minute. Slowly release the brake pedal.

5. Keep the engine running and

check the transmission fluid temperature on the Driver Information Center (DIC). See Driver Information Center (DIC) (Base Level) on page 5-30 or Driver Information Center (DIC) (Uplevel) on page 5-32.

6. Using the transmission fluid

temperature reading, determine and perform the appropriate check procedure. If the transmission fluid temperature reading is not within the required temperature ranges, allow the vehicle to cool, or operate the vehicle until the appropriate transmission fluid temperature is reached.

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2. Flip the handle up, then pull out

6. Perform a hot check at the

Vehicle Care

10-17

Cold Check Procedure Use this procedure only as a reference to determine if the transmission has enough fluid to be operated safely until a hot check procedure can be made. The hot check procedure is the most accurate method to check the fluid level. Perform the hot check procedure at the first opportunity. Use this cold check procedure to check fluid level when the transmission temperature is between 27°C and 32°C (80°F and 90°F).

3.

the dipstick and wipe it with a clean rag or paper towel. Install the dipstick by pushing it back in all the way; wait three seconds, and then pull it back out again.

4. Check both sides of the dipstick and read the lower level. Repeat the check procedure to verify the reading.

5.

If the fluid level is below the COLD check band, add only enough fluid as necessary to bring the level into the COLD band. It does not take much fluid, generally less than 0.5 L (1 pt). Do not overfill.

1. Locate the transmission dipstick

at the rear of the engine compartment, on the passenger side of the vehicle. See Engine Compartment Overview on page 10-6.

7.

first opportunity after the transmission reaches a normal operating temperature between 71°C to 93°C (160°F to 200°F). If the fluid level is in the acceptable range, push the dipstick back in all the way, then flip the handle down to lock the dipstick in place.

Hot Check Procedure Use this procedure to check the transmission fluid level when the transmission fluid temperature is between 71°C and 93°C (160°F and 200°F). The hot check is the most accurate method to check the fluid level. The hot check should be performed at the first opportunity in order to verify the cold check. The fluid level rises as fluid temperature increases, so it is important to ensure the transmission temperature is within range.

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10-18

Vehicle Care

1. Locate the transmission dipstick

at the rear of the engine compartment, on the passenger side of the vehicle. See Engine Compartment Overview on page 10-6.

2. Flip the handle up, then pull out

3.

the dipstick and wipe it with a clean rag or paper towel. Install the dipstick by pushing it back in all the way; wait three seconds, and then pull it back out again.

4. Check both sides of the dipstick and read the lower level. Repeat the check procedure to verify the reading.

6.

5. Safe operating level is within the

HOT cross hatch band on the dipstick. If the fluid level is not within the HOT band, and the transmission temperature is between 71°C and 93°C (160°F and 200°F), add or drain fluid as necessary to bring the level into the HOT band. If the fluid level is low, add only enough fluid to bring the level into the HOT band. It does not take much fluid, generally less than 0.5 L (1 pt). Do not overfill. If the fluid level is in the acceptable range, push the dipstick back in all the way, then flip the handle down to lock the dipstick in place.

Consistency of Readings Always check the fluid level at least twice using the procedure described previously. Consistency (repeatable readings) is important to maintaining proper fluid level. If readings are still inconsistent, contact the dealer.

Automatic Transmission Fluid (8 Speed Transmission)

When to Check and Change Automatic Transmission Fluid It is usually not necessary to check the transmission fluid level. The only reason for fluid loss is a transmission leak or overheated transmission. This vehicle is not equipped with a transmission fluid level dipstick. There is a special procedure for checking and changing the transmission fluid in these vehicles. Because this procedure is difficult, this should be done at the dealer. Contact the dealer for additional information or

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the procedure can be found in the service manual. See Service Publications Ordering Information on page 13-11.

{ Caution

Use of the incorrect automatic transmission fluid may damage the vehicle, and the damage may not be covered by the vehicle warranty. Always use the automatic transmission fluid listed in Recommended Fluids and Lubricants on page 11-12.

Change the fluid and filter at the scheduled maintenance intervals listed in Maintenance Schedule on page 11-3. Be sure to use the transmission fluid listed in Recommended Fluids and Lubricants on page 11-12.

Manual Transmission Fluid It is not necessary to check the manual transmission fluid level. A transmission fluid leak is the only reason for fluid loss. If a leak occurs, take the vehicle to your dealer service department and have it repaired as soon as possible. See Recommended Fluids and Lubricants on page 11-12 for the proper fluid to use.

Hydraulic Clutch For vehicles with a manual transmission, it is not necessary to regularly check clutch fluid unless you suspect there is a leak in the system. Adding fluid will not correct a leak. A fluid loss in this system could indicate a problem. Have the system inspected and repaired.

Vehicle Care

10-19

When to Check and What to Use The hydraulic clutch fluid reservoir is filled with DOT 3 brake fluid as indicated on the reservoir cap. See Engine Compartment Overview on page 10-6 for reservoir location. How to Check and Add Fluid Visually check the clutch fluid reservoir to make sure the fluid level is at the MIN (minimum) line on the side of the reservoir. The hydraulic clutch fluid system should be closed and sealed. Do not remove the cap to check the fluid level or to top-off the fluid level. Remove the cap only when necessary to add the proper fluid until the level reaches the MIN line.

Engine Air Cleaner/Filter If the vehicle has a diesel engine, see “Pickup Models” under “Engine Air Cleaner/Filter” in the Duramax

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10-20

Vehicle Care

diesel supplement for the correct inspection and replacement procedures. See Engine Compartment Overview on page 10-6 for the location of the engine air cleaner/filter. When to Inspect the Engine Air Cleaner/Filter Inspect the air cleaner/filter at the scheduled maintenance intervals and replace it at the first oil change after each 80 000 km (50,000 mi) interval. See Maintenance Schedule on page 11-3. If driving in dusty/dirty conditions, inspect the filter at each engine oil change. How to Inspect the Engine Air Cleaner/Filter To inspect the air cleaner/filter, remove the engine air cleaner/filter from the vehicle by following Steps 1−8. When the engine air cleaner/filter is removed, lightly shake it to release loose dust and dirt. If the engine air cleaner/filter

remains covered with dirt, a new filter is required. Never use compressed air to clean the filter.

Replacing the Engine Air Cleaner/ Filter

1. Screws 2. Electrical Connectors 3. Air Duct Clamp

1. Locate the air cleaner/filter

assembly. See Engine Compartment Overview on page 10-6.

2. Disconnect the outlet duct by

loosening the air duct clamp (3).

3. Disconnect the electrical

connectors (2) and the connector harness from the cover.

4. Remove the four screws (1) on top of the cover of the housing and lift up the cover.

5. Remove the engine air cleaner/

filter from the housing. Take care to dislodge as little dirt as possible.

6. Clean the engine air cleaner/ filter sealing surfaces and the housing. Inspect or replace the engine air cleaner/filter.

7.

8. Reverse Steps 2–4 to reinstall

the filter cover housing.

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{ Warning

Operating the engine with the air cleaner/filter off can cause you or others to be burned. The air cleaner not only cleans the air; it helps to stop flames if the engine backfires. Use caution when working on the engine and do not drive with the air cleaner/filter off.

{ Caution

If the air cleaner/filter is off, dirt can easily get into the engine, which could damage it. Always have the air cleaner/filter in place when you are driving.

Cooling System If the vehicle has the Duramax diesel engine, see the Duramax diesel supplement.

The cooling system allows the engine to maintain the correct working temperature.

Vehicle Care

10-21

{ Warning

An electric engine cooling fan can start even when the engine is not running. To avoid injury, always keep hands, clothing, and tools away from any engine cooling fan.

5.3L V8 Engine Shown, 4.3L V6 Engine and 6.2L V8 Engine

Similar

1. Coolant Surge Tank 2. Coolant Surge Tank

Pressure Cap

3. Engine Electric Cooling Fans

6.0L V8 Engine

1. Coolant Surge Tank 2. Coolant Surge Tank

Pressure Cap

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10-22

Vehicle Care

3. Engine Belt-Driven

Cooling Fan

{ Warning

Heater and radiator hoses, and other engine parts, can be very hot. Do not touch them. If you do, you can be burned. Do not run the engine if there is a leak. If you run the engine, it could lose all coolant. That could cause an engine fire, and you could be burned. Get any leak fixed before you drive the vehicle.

{ Caution Using coolant other than DEX-COOL® can cause premature engine, heater core, or radiator corrosion. In addition, the engine coolant could require changing sooner. Any repairs

(Continued)

Caution (Continued)

would not be covered by the vehicle warranty. Always use DEX-COOL (silicate-free) coolant in the vehicle.

Engine Coolant The cooling system in the vehicle is filled with DEX-COOL® engine coolant. This coolant is designed to remain in the vehicle for 5 years or 240 000 km (150,000 mi), whichever occurs first. 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 on page 10-25.

What to Use

{ Warning

Adding only plain water or some other liquid to the cooling system can be dangerous. Plain water and other liquids, can boil before the proper coolant mixture will. The coolant warning system is set for the proper coolant mixture. With plain water or the wrong mixture, the engine could get too hot but you would not get the overheat warning. The engine could catch fire and you or others could be burned. Use a 50/ 50 mixture of clean, drinkable water and DEX-COOL coolant.

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Caution (Continued)

mixture can freeze and crack engine cooling parts. The repairs would not be covered by the vehicle warranty. Use only the proper mixture of engine coolant for the cooling system. See Recommended Fluids and Lubricants on page 11-12.

Never dispose of engine coolant by putting it in the trash, or by pouring it on the ground, or into sewers, streams, or bodies of water. Have the coolant changed by an authorized service center, familiar with legal requirements regarding used coolant disposal. This will help protect the environment and your health.

Vehicle Care

10-23

Checking Coolant The coolant surge tank is located in the engine compartment on the passenger side of the vehicle. See Engine Compartment Overview on page 10-6. The vehicle must be on a level surface when checking the coolant level. Check to see if coolant is visible in the coolant surge tank. If the coolant inside the coolant surge tank is boiling, wait until it cools down. The coolant level should be at or above the FULL COLD mark. If it is not, there may be a leak in the cooling system. If coolant is visible but the coolant level is not at or above the FULL COLD mark, see “How to Add Coolant to the Coolant Surge Tank for Gasoline Engines,” following.

Use a 50/50 mixture of clean, drinkable water and DEX-COOL coolant. If using this mixture, nothing else needs to be added. This mixture: . Gives freezing protection down

to −37°C (−34°F), outside temperature.

. Gives boiling protection up to

129°C (265°F), engine temperature.

. Protects against rust and

corrosion.

. Will not damage aluminum parts. . Helps keep the proper engine

temperature.

{ Caution

If improper coolant mixture, inhibitors, or additives are used in the vehicle cooling system, the engine could overheat and be damaged. Too much water in the

(Continued)

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10-24

Vehicle Care

Warning (Continued)

the cap when the cooling system, including the surge tank pressure cap, is hot. Wait for the cooling system and surge tank pressure cap to cool.

If no coolant is visible in the surge tank, add coolant.

Light-Duty

Heavy-Duty

Coolant Surge

Coolant Surge

Tank

Tank

Pressure Cap

Pressure Cap

{ Warning

You can be burned if you spill coolant on hot engine parts. Coolant contains ethylene glycol and it will burn if the engine parts are hot enough. Do not spill coolant on a hot engine.

{ Caution

This vehicle has a specific coolant fill procedure. Failure to follow this procedure could cause the engine to overheat and be severely damaged.

{ Warning

Steam and scalding liquids from a hot cooling system can blow out and burn you badly. Never turn

(Continued)

5.3L V8 Shown, 4.3L V6, 6.0L V8,

and 6.2L V8 Similar

How to Add Coolant to the Coolant Surge Tank for Gasoline Engines If the vehicle has a diesel engine, see “Cooling System” in the Duramax diesel supplement for the proper coolant fill procedure.

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Vehicle Care

10-25

mixture to the coolant surge tank until the level reaches the FULL COLD mark.

5. Replace the pressure cap tightly. 6. Verify coolant level after the

engine is shut off and the coolant is cold. If necessary, repeat coolant fill procedure Steps 1–6.

{ Caution

If the pressure cap is not tightly installed, coolant loss and possible engine damage may occur. Be sure the cap is properly and tightly secured.

Engine Overheating If the vehicle has the Duramax diesel engine, see the Duramax diesel supplement.

{ Caution

Running the engine without coolant may cause damage or a fire. Vehicle damage would not be covered by the vehicle warranty.

The vehicle has several indicators to warn of engine overheating. There is a coolant temperature gauge in the vehicle's instrument cluster. See Engine Coolant Temperature Gauge on page 5-16. In addition, there are ENGINE OVERHEATED STOP ENGINE, ENGINE OVERHEATED IDLE ENGINE, and ENGINE POWER IS REDUCED messages in the Driver Information Center (DIC). See Engine Cooling System Messages on page 5-37 and Engine Power Messages on page 5-39.

1. Remove the coolant surge tank pressure cap when the cooling system, including the coolant surge tank pressure cap and upper radiator hose, is no longer hot. Turn the pressure cap slowly counterclockwise about one full turn. If a hiss is heard, wait for that to stop. A hiss means there is still some pressure left.

2. Keep turning the pressure cap

slowly, and remove it.

3. Fill the coolant surge tank with the proper mixture to the FULL COLD mark.

4. With the coolant surge tank

pressure cap off, start the engine and let it run until the engine coolant temperature gauge indicates approximately 90°C (195°F). By this time, the coolant level inside the coolant surge tank may be lower. If the level is lower, add more of the proper

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Vehicle Care

If the decision is made not to lift the hood when this warning appears, get service help right away. See Roadside Assistance Program on