2024 GMC SIERRA DENALI heater

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16908340) - 2024 - CRC - 12/7/22
Vehicle Care 319
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 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.
{Warning
An underhood electric fan can start up
even when the engine is not running and
can cause injury. Keep hands, clothing,
and tools away from any underhood
electric fan.
1. Engine Cooling Fan (Out of View)
2. Coolant Surge Tank and Pressure Cap
{Warning
Do not touch heater, radiator, a/c pipes
or hoses, or other engine parts. They can
be very hot and can burn you. Do not
run the engine if there is a leak; all
coolant could leak out. That could cause
an engine fire and can burn you. Fix any
leak before driving the vehicle.
Engine Coolant
The cooling system in the vehicle is filled
with DEX-COOL engine coolant. This coolant
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, seeEngine Overheating 0321.
What to Use
{Warning
Plain water, or other liquids such as
alcohol, can boil before the proper
coolant mixture will. With plain water or
the wrong mixture, the engine could get
too hot but there would not be an
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. This mixture:
.Gives freezing protection down to −37 °C
(−34 °F), outside temperature.
.Gives boiling protection up to 129 °C
(265 °F), engine temperature.

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16908340) - 2024 - CRC - 12/7/22
322 Vehicle Care
If the decision is made not to lift the hood
when this warning appears, get service help
right away. SeeRoadside Assistance Program
0 408.
If the decision is made to lift the hood,
make sure the vehicle is parked on a level
surface.
Check to see if the engine cooling fans are
running. If the engine is overheating, the
fans should be running. If they are not, do
not continue to run the engine and have the
vehicle serviced.
If the engine or transmission detects an
impending hot fluid condition, then the
transmission may force upshifts to limit
temperatures. Downshifts may also be
prevented in this instance. Normal operation
may continue unless the display indicates
there is a hot condition and engine should
be idled.If Steam is Coming from the Engine
Compartment
{Warning
Steam and scalding liquids from a hot
cooling system are under pressure.
Turning the pressure cap, even a little,
can cause them to come out at high
speed and you could be burned. Never
turn the cap when the cooling system,
including the pressure cap, is hot. Wait
for the cooling system and pressure cap
to cool.
If No Steam is Coming from the Engine
Compartment
The ENGINE OVERHEATED STOP ENGINE or
the ENGINE OVERHEATED IDLE ENGINE
message, along with a low coolant
condition, can indicate a serious problem.
If there is an engine overheat warning, but
no steam is seen or heard, the problem may
not be too serious. Sometimes the engine
can get a little too hot when the vehicle:
.Climbs a long hill on a hot day.
.Stops after high-speed driving.
.Idles for long periods in traffic.
.Tows a trailer; see Trailer Towing0280.
If the ENGINE OVERHEATED STOP ENGINE or
the ENGINE OVERHEATED IDLE ENGINE
message appears with no sign of steam, try
this for a minute or so: 1. Turn the air conditioning off.
2. Turn the heater on to the highest temperature and to the highest fan
speed. Open the windows as necessary.
3. When it is safe to do so, pull off the road, shift to P (Park) or N (Neutral) and
let the engine idle.
If the temperature overheat gauge is no
longer in the overheat zone or an overheat
warning no longer displays, the vehicle can
be driven. Continue to drive the vehicle
slowly for about 10 minutes. Keep a safe
vehicle distance from the vehicle in front.
If the warning does not come back on,
continue to drive normally and have the
cooling system checked for proper fill and
function.
If the warning continues, pull over, stop, and
park the vehicle right away.
If there is still no sign of steam and the
vehicle is equipped with an engine driven
cooling fan, push down the accelerator until
the engine speed is about twice as fast as

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16908340) - 2024 - CRC - 12/7/22
Vehicle Care 339
FusesUsage
6 –
7 ELM 4 –Electronic
Lighting Module 4
8 –
9 –
10 ELM 6 –Electronic
Lighting Module 6
11 BCM 3 –Body Control
Module 3
12 Rear Window Defogger
13 Washer Front
14 –
15 –
16 –
17 IECL 1
19 DC/AC Inverter
20 IECR 2 (LD)/EBCM2 (HD) 21 –
22 IECL 2
24 Fuel Heater (DSL) Fuses
Usage
25 EBCM 1 –Electronic
Brake Control Module 1
26 –
27 Horn
28 Parking Lamp Mirror/ Grill (LD)/Parking Lamp
Left (HD)
29 Parking Lamp Right (HD)
30 ELM 3 –Electronic
Lighting Module 3
31 ELM 1 –Electronic
Lighting Module 1
32 –
33 Not R/C
34 Radars (LD) 37 MISC IP Headliner Ignition
38 Seat Fan Ignition
39 Trailer Ignition Module
40 Misc Ignition 41 Trailer Parking Lamp Fuses
Usage
42 Tail Lamp Left (HD)
44 DEFC/ICCM Ignition (LD/ HD)/FTZM Ignition (HD)
45 Secondary Axle Motor
46 Engine Control Module Ignition
47 –
48 –
49 Transmission Auxiliary Oil Pump (LD)
50 A/C Clutch 51 Transfer Case Control Module
52 Front Wiper
53 Center High-Mounted Stop Lamp
54 Tail Lamp Right (HD) 55 Trailer Back-up Lamp
56 SADS (LD)/Fuel Tank Zone Module 2 (HD)
57 TTPM/SBZA
58 Starter Motor (LD)

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16908340) - 2024 - CRC - 12/7/22
340 Vehicle Care
FusesUsage
60 Powertrain Sensor 2 (DSL)
61 Active Hydraulic Steering (HD)
62 DEFC Batt 1/CVS
63 Trailer Brake
65 –
66 Cooling Fan Motor Left (LD)
67 –
68 DEFC Batt 2
69 Starter Pinion (LD Gas)/ Starter Motor (HD)
71 Cooling Fan Lower (LD)
72 Cooling Fan Right (LD)
73 Trailer Stop/Turn Lamp Left
74 Trailer Interface Module 2
75 Integrated Chassis Control Module
76 Electric RNG BDS Fuses
Usage
78 Engine Control Module
79 Cabin Cool Pump 17W (LD)/Auxiliary
Battery (HD)
80 Powertrain Sensor 1 (DSL)
81 Trailer Stop/Turn Lamp Right
82 Trailer Interface Module 1
83 FTZM 1
84 Trailer Battery 85 –
86 Engine Control Module 87 Injector B Even
88 O2 B Sensor
89 O2 A Sensor
90 Injector A Odd 91 Engine Control Module Throttle Control (HD) Fuses
Usage
92 Cool Fan Clutch (HD DSL)/Aeroshutter
(LD/HD)
Relays Usage
5 Rear Window Defogger
18 DC/AC Inverter
23 Fuel Heater (DSL)
35 Parking Lamp
36 Run/Crank
43 Secondary Axle Motor
59 A/C Clutch
64 Starter Motor (LD)/Cool Fan Clutch (HD DSL)
70 Starter Pinion (LD Gas)/ Starter Motor (HD)
77 Powertrain

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16908340) - 2024 - CRC - 12/7/22
428 Index
Data Collection (cont'd)OnStar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 416
Data Recorders, Event . . . . . . . . . . . . . . . . . . . .415
Daytime Running Lamps (DRL) . . . . . . . . . . . .145
Defensive Driving . . . . . . . . . . . . . . . . . . . . . . . . 200
Delayed Locking . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Destination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166
Diagnostics Connected Services . . . . . . . . . . . . . . . . . . . . 424
Disabled Vehicle Transporting . . . . . . . . . . . . . . . . . . . . . . . . . . . 379
Distracted
Driving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 199
Distracted Driving . . . . . . . . . . . . . . . . . . . . . . . . 199
Dome Lamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150
Door Ajar Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
Delayed Locking . . . . . . . . . . . . . . . . . . . . . . . . 23
Locks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Power Locks . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Drive Belt Routing, Engine . . . . . . . . . . . . . . . 404
Drive Systems
Four-Wheel Drive . . . . . . . . . . . . . . . . . . . . . . 329
Driver Assistance Systems, Advanced . . . . . . . . . 252
Information Center (DIC) . . . . . . . . . . . 131, 133
Mode Control . . . . . . . . . . . . . . . . . . . . . . . . . . 238
Mode Control Light . . . . . . . . . . . . . . . . . . . . 128 Driver (cont'd)
Teen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185
Driving Assistance Systems . . . . . . . . . . . . . . . . . . . . 263
Better Fuel Economy . . . . . . . . . . . . . . . . . . . 199
Characteristics and Towing Tips . . . . . . . . 276
Defensive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200
Hill and Mountain Roads . . . . . . . . . . . . . . 207
If the Vehicle is Stuck . . . . . . . . . . . . . . . . . 209
Impaired . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200
Loss of Control . . . . . . . . . . . . . . . . . . . . . . . . 202
Off-Road . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203
Off-Road Recovery . . . . . . . . . . . . . . . . . . . . . 202
Vehicle Load Limits . . . . . . . . . . . . . . . . . . . . 210
Wet Roads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206
Winter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207
Dual Automatic Climate Control System . . . . 193
E
E85 or FlexFuel . . . . . . . . . . . . . . . . . . . . . . . . . . 272
ElectricParking Brake . . . . . . . . . . . . . . . . . . . . . . . . . . 234
Parking Brake Light . . . . . . . . . . . . . . . . . . . . 124
Electrical Equipment, Add-On . . . . . . . . . . . . . . . . . . . . 306
System Overload . . . . . . . . . . . . . . . . . . . . . . 335 Electrical System
Engine Compartment Fuse Block . . . . . . . 337
Fuses and Circuit Breakers . . . . . . . . . . . . . 337
Instrument Panel Fuse Block . . . . . . 341, 342
Electronic Stability Control (ESC) Off Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
Emergency
OnStar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 418
Engine Air Cleaner/Filter . . . . . . . . . . . . . . . . . . . . . . 318
Air Filter Life System . . . . . . . . . . . . . . . . . . . 317
Check Light (Malfunction Indicator) . . . . 122
Compartment Overview . . . . . . . . . . . . . . . . 313
Coolant Temperature Gauge . . . . . . . . . . . . 118
Coolant Temperature WarningLight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
Cooling System . . . . . . . . . . . . . . . . . . . . . . . . 319
Drive Belt Routing . . . . . . . . . . . . . . . . . . . . . 404
Exhaust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 222
Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 323
Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 219
Oil Life System . . . . . . . . . . . . . . . . . . . . . . . . 316
Oil Pressure Gauge . . . . . . . . . . . . . . . . . . . . . 117
Oil Pressure Light . . . . . . . . . . . . . . . . . . . . . . 129
Overheated Protection Operating Mode . . . . . . . . . . . . . . . . . . . . . 323
Overheating . . . . . . . . . . . . . . . . . . . . . . . . . . . 321
Power Messages . . . . . . . . . . . . . . . . . . . . . . . 139

GMC Sierra/Sierra Denali 2500 HD/3500 HD Owner Manual (GMNA-
Localizing-U.S./Canada-16908340) - 2024 - CRC - 12/7/22
430 Index
General Information (cont'd)Vehicle Care . . . . . . . . . . . . . . . . . . . . . . . . . . . 310
Glass Replacement . . . . . . . . . . . . . . . . . . . . . . . . 331
Global Positioning System (GPS) . . . . . . . . . 167
Glove Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
GM Mobility Reimbursement Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 408
Guidance Problems with the Route . . . . . . . . . . . . . . 168
H
Halogen Bulbs . . . . . . . . . . . . . . . . . . . . . . . . . . . 333
Hazard Warning Flashers . . . . . . . . . . . . . . . . 146
Head Restraints . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Head-Up Display (HUD) . . . . . . . . . . . . . . . . . . . 135
HeadlampsAiming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 333
Automatic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
Bulb Replacement . . . . . . . . . . . . . . . . . . . . . . 333
Daytime Running Lamps (DRL) . . . . . . . . . 145
Flash-to-Pass . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
Headlamps, Front Turn Signal,
Sidemarker, and Parking Lamps . . . . . . 333
High-Beam On Light . . . . . . . . . . . . . . . . . . . 130
High/Low Beam Changer . . . . . . . . . . . . . . 145
Lamps On Reminder . . . . . . . . . . . . . . . . . . . 130 Heated
Mirrors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Rear Seats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Steering Wheel . . . . . . . . . . . . . . . . . . . . . . . . 105
Ventilated Front Seats . . . . . . . . . . . . . . . . . . 54
Heater Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 219
Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191, 193
High-Beam On Light . . . . . . . . . . . . . . . . . . . . . 130
Hill Descent Control (HDC) . . . . . . . . . . . . . . . . . 237
Descent Control Light . . . . . . . . . . . . . . . . . . 126
Hill and Mountain Roads . . . . . . . . . . . . . . . . 207
Hill Start Assist (HSA) . . . . . . . . . . . . . . . . . . . . 235
Hood . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 312
Horn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
How to Wear Seat Belts Properly . . . . . . . . . 58
HVAC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191, 193
I
Ignition Positions . . . . . . . . . . . . . . . . . . . . . . . . 216
Immobilizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Indicator Pedestrian Ahead . . . . . . . . . . . . . . . . . . . . . . 126
Vehicle Ahead . . . . . . . . . . . . . . . . . . . . . . . . . 126
Indicators
Warning Lights and Gauges . . . . . . . . . . . . . 111
Infants and Young Children, Restraints . . . . 76 Information
Publication Ordering . . . . . . . . . . . . . . . . . . . 413
Infotainment Using the System . . . . . . . . . . . . . . . . . . . . . . . 157
Infotainment System . . . . . . . . . . . . . . . . . . . . 416
Inspection Multi-Point Vehicle . . . . . . . . . . . . . . . . . . . . 396
Instrument Cluster . . . . . . . . . . . . . . . . . . . . 112, 113
Instrument Panel Overview . . . . . . . . . . . . . . . . .5
Interior Rearview Mirrors . . . . . . . . . . . . . . . . . 38
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . 2, 153
J
Jump Starting - North America . . . . . . . . . . . . . . . 376
K
Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14Remote . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Remote Operation . . . . . . . . . . . . . . . . . . . . . . . 15
L
Labeling, Tire Sidewall . . . . . . . . . . . . . . . . . . . 346
LampsAuxiliary Roof Mounted Lamp . . . . . . . . . 148
Daytime Running (DRL) . . . . . . . . . . . . . . . . 145
Dome . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150
Exterior Cargo . . . . . . . . . . . . . . . . . . . . . . . . . 149
Exterior Controls . . . . . . . . . . . . . . . . . . . . . . . 143