2021 GMC ACADIA heater

GMC Acadia/Acadia Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-14608671) - 2021 - CRC - 10/26/20
282 Vehicle Care
2.5L L4 Engine
1. Engine Cooling Fan (Out of View)
2. Engine Coolant Surge Tank andPressure Cap
3.6L V6 Engine
1. Engine Cooling Fan (Out of View)
2. Engine Coolant Surge Tank andPressure Cap
{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.
{Warning
Do not touch heater or radiator 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
needs to be checked and replaced at
appropriate intervals. See Maintenance
Schedule 0346.
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 0285.
What to Use
{Warning
Do not touch heater or radiator hoses,
or other engine parts. They can be very
hot and can burn you. Do not run the
(Continued)

GMC Acadia/Acadia Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-14608671) - 2021 - CRC - 10/26/20
286 Vehicle Care
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
If an engine overheat warning is displayed
but no steam can be 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.
If the overheat warning is displayed with no
sign of steam: 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 engine coolant temperature gauge is
no longer in the overheated area, the
vehicle can be driven. Continue to drive the
vehicle slowly for about 10 minutes. Keep a
safe 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 no sign of steam, idle the engine
for three minutes while parked. If the
warning is still displayed, turn off the
engine until it cools down.
Washer Fluid
What to Use
When windshield washer fluid is needed, be
sure to read the manufacturer's instructions
before use. If operating the vehicle in an area where the temperature may fall below
freezing, use a fluid that has sufficient
protection against freezing.
Adding Washer Fluid
Open the cap with the washer symbol on it.
Add washer fluid until the tank is full. See
Engine Compartment Overview
0271 for
reservoir location.
Caution
.Do not use washer fluid that contains
any type of water repellent coating.
This can cause the wiper blades to
chatter or skip.
.Do not use engine coolant (antifreeze)
in the windshield washer. It can
damage the windshield washer system
and paint.
(Continued)

GMC Acadia/Acadia Denali Owner Manual (GMNA-Localizing-U.S./Canada/-
Mexico-14608671) - 2021 - CRC - 10/26/20
386 Index
Driving (cont'd)Impaired . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201
Loss of Control . . . . . . . . . . . . . . . . . . . . . . . . 203
Off-Road . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203
Off-Road Recovery . . . . . . . . . . . . . . . . . . . . . 203
Vehicle Load Limits . . . . . . . . . . . . . . . . . . . . 209
Wet Roads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207
Winter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208
Dual Automatic Climate Control System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192
E
Electric Brake Boost . . . . . . . . . . . . . . . . . . . . . . 224
Electric Parking Brake . . . . . . . . . . . . . . . . . . . . 224
Electric Parking Brake Light . . . . . . . . . . . . . . 109
Electrical Equipment, Add-On . . . . . . . . . . . . 266
Electrical SystemEngine Compartment Fuse Block . . . . . . . 293
Fuses and Circuit Breakers . . . . . . . . . . . . . 293
Instrument Panel Fuse Block . . . . . . . . . . . 296
Overload . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 292
Rear Compartment Fuse Block . . . . . . . . . 298
Emergency OnStar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 376
Engine Air Cleaner/Filter . . . . . . . . . . . . . . . . . . . . . . 279
Check Light (Malfunction Indicator) . . . . 107
Compartment Overview . . . . . . . . . . . . . . . . . 271 Engine (cont'd)
Coolant Temperature Gauge . . . . . . . . . . . 104
Coolant Temperature Warning Light . . . . 112
Cooling System . . . . . . . . . . . . . . . . . . . . . . . . 281
Drive Belt Routing . . . . . . . . . . . . . . . . . . . . . 362
Exhaust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 219
Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216
Oil Life System . . . . . . . . . . . . . . . . . . . . . . . . 278
Oil Pressure Light . . . . . . . . . . . . . . . . . . . . . . . 113
Overheating . . . . . . . . . . . . . . . . . . . . . . . . . . . 285
Power Messages . . . . . . . . . . . . . . . . . . . . . . . 123
Running While Parked . . . . . . . . . . . . . . . . . 220
Starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214
Engine Air Filter Life System . . . . . . . . . . . . . 279
Engine Oil Temperature Gauge . . . . . . . . . . . . . . . . . . . . 103
Entry Lighting . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
Equipment, Towing . . . . . . . . . . . . . . . . . . . . . . 262
Event Data Recorders . . . . . . . . . . . . . . . . . . . . 373
Exit Lighting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
Extended Parking . . . . . . . . . . . . . . . . . . . . . . . . 219
Extender, Seat Belt . . . . . . . . . . . . . . . . . . . . . . . .53
Exterior Lamp Controls . . . . . . . . . . . . . . . . . . . . 131
Exterior Lamps Off Reminder . . . . . . . . . . . . . 132
Exterior Lighting Battery Saver . . . . . . . . . . . 137
F
Filter, Engine Air Cleaner . . . . . . . . . . . . . . . . . . . . . 279
Flash-to-Pass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132
Flashers, Hazard Warning . . . . . . . . . . . . . . . . .134
Flat Tire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 319 Changing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 326
Floor Mats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 343
Fluid Automatic Transmission . . . . . . . . . . . . . . . 279
Brakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 287
Washer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 286
Fog Lamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .134
Folding Mirrors . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Forward Collision Alert (FCA) System . . . . 245
Frequency Statement Radio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 371
Front Fog Lamp Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
Front Pedestrian Braking (FPB) System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 248
Front Seats Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Heated and Ventilated . . . . . . . . . . . . . . . . . . 41
Fuel Additives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 254
Economy, Driving for Better . . . . . . . . . . . 200
Filling a Portable Fuel Container . . . . . . . 256

GMC Acadia/Acadia Denali Owner Manual (GMNA-Localizing-U.S./Canada/-
Mexico-14608671) - 2021 - CRC - 10/26/20
Index 387
Fuel (cont'd)Filling the Tank . . . . . . . . . . . . . . . . . . . . . . . . 254
Foreign Countries . . . . . . . . . . . . . . . . . . . . . . 254
Gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Low Fuel Warning Light . . . . . . . . . . . . . . . . 114
Management, Active . . . . . . . . . . . . . . . . . . . 219
Prohibited Fuels . . . . . . . . . . . . . . . . . . . . . . . 254
Recommended . . . . . . . . . . . . . . . . . . . . . . . . . 253
Top Tier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 253
Fuses Engine Compartment Fuse Block . . . . . . . 293
Fuses and Circuit Breakers . . . . . . . . . . . . . 293
Instrument Panel Fuse Block . . . . . . . . . . . 296
Rear Compartment Fuse Block . . . . . . . . . 298
G
Garage Door Opener . . . . . . . . . . . . . . . . . . . . . . 127Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
Gas Strut(s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 291
Gauges Engine Coolant Temperature . . . . . . . . . . . 104
Engine Oil Temperature . . . . . . . . . . . . . . . . 103
Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Odometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Speedometer . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Tachometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Trip Odometer . . . . . . . . . . . . . . . . . . . . . . . . . 102
Voltmeter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104 Gauges (cont'd)
Warning Lights and Indicators . . . . . . . . . . 96
Gear Shifting Light . . . . . . . . . . . . . . . . . . . . . . . .110
General Information Service and Maintenance . . . . . . . . . . . . . . 345
Towing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 256
Vehicle Care . . . . . . . . . . . . . . . . . . . . . . . . . . . 268
Global Positioning System (GPS) . . . . . . . . . . 161
Glove Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
GM Mobility Reimbursement Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 366
Guidance
Problems with the Route . . . . . . . . . . . . . . 162
H
Halogen Bulbs . . . . . . . . . . . . . . . . . . . . . . . . . . . 292
Hazard Warning Flashers . . . . . . . . . . . . . . . . .134
HD Radio Technology . . . . . . . . . . . . . . . . . . . . .145
Head Restraints . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Head-up Display . . . . . . . . . . . . . . . . . . . . . . . . . . 119
HeadlampsAiming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 292
Automatic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
Bulb Replacement . . . . . . . . . . . . . . . . . . . . . . 292
Daytime Running Lamps (DRL) . . . . . . . . . 133
Flash-to-Pass . . . . . . . . . . . . . . . . . . . . . . . . . . . 132
High-Beam On Light . . . . . . . . . . . . . . . . . . . . 114
High/Low Beam Changer . . . . . . . . . . . . . . 132 Headlamps (cont'd)
Lamps On Reminder . . . . . . . . . . . . . . . . . . . . 114
Heated Rear Seats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Steering Wheel . . . . . . . . . . . . . . . . . . . . . . . . . 90
Heated and Ventilated Front Seats . . . . . . . .41
Heated Mirrors . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Heater Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216
Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .192, 196
High-Beam On Light . . . . . . . . . . . . . . . . . . . . . . 114
High-Speed Operation . . . . . . . . . . . . . . . . . . . 308
Hill and Mountain Roads . . . . . . . . . . . . . . . . 207
Hill Descent Control (HDC) . . . . . . . . . . . . . . . 228
Hill Descent Control Light . . . . . . . . . . . . . . . . .110
Hill Start Assist (HSA) . . . . . . . . . . . . . . . . . . . . 226
Hood . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 270
Horn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .91
How to Wear Seat Belts Properly . . . . . . . . . 48
HVAC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .192, 196
I
If the System Needs Service . . . . . . . . . . . . . 162
Ignition Positions . . . . . . . . . . . . . . . . . . . . . . . . . 213
Immobilizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Indicator Pedestrian Ahead . . . . . . . . . . . . . . . . . . . . . . . 111
Vehicle Ahead . . . . . . . . . . . . . . . . . . . . . . . . . . 111