2021 BUICK ENVISION cooling

Buick E2UB-N Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
14583509) - 2021 - CRC - 1/8/21
124 Lighting
remote key. The entry lighting feature for
exterior lighting can be changed by vehicle
locator lights. SeeVehicle Personalization
0 109.
Exit Lighting
Some exterior lamps come on at night, or in
areas with limited lighting, when the driver
door is opened after the ignition is turned
off. The dome lamp comes on when any
door is opened or the ignition is turned OFF.
The exterior lamps and dome lamp remain
on after the door is closed for a set amount
of time, then automatically turn off.
The exterior lamps turn off immediately by
turning the exterior lamp control off.
The exit lighting for exterior lights can be
changed. See Vehicle Personalization 0109.
Battery Load Management
The vehicle has Electric Power Management
(EPM), which estimates the battery's
temperature and state of charge. It then
adjusts the voltage for best performance
and extended life of the battery.
When the battery's state of charge is low,
the voltage is raised slightly to quickly bring
the charge back up. When the state of charge is high, the voltage is lowered
slightly to prevent overcharging. The
voltmeter gauge or the voltage display on
the Driver Information Center (DIC),
if equipped, may show the voltage moving
up or down. This is normal. If there is a
problem, an alert will be displayed.
The battery can be discharged at idle if the
electrical loads are very high. This is true for
all vehicles. This is because the generator
(alternator) may not be spinning fast
enough at idle to produce all the power that
is needed for very high electrical loads.
A high electrical load occurs when several of
the following are on, such as: headlamps,
high beams, fog lamps, rear window
defogger, climate control fan at high speed,
heated seats, engine cooling fans, trailer
loads, and loads plugged into accessory
power outlets.
EPM works to prevent excessive discharge of
the battery. It does this by balancing the
generator's output and the vehicle's
electrical needs. It can increase engine idle
speed to generate more power, whenever
needed. It can temporarily reduce the power
demands of some accessories.
Normally, these actions occur in steps or
levels, without being noticeable. In rare
cases at the highest levels of corrective
action, this action may be noticeable to the
driver. If so, a DIC message might be
displayed and it is recommended that the
driver reduce the electrical loads as much as
possible.
Battery Power Protection
The battery saver feature is designed to
protect the vehicle's battery.
If some interior lamps are left on and the
ignition is turned off, the battery rundown
protection system automatically turns the
lamp off after some time.
Exterior Lighting Battery Saver
The exterior lamps turn off about 10 minutes
after the ignition is turned off, if the parking
lamps or headlamps have been manually
left on. This protects against draining the
battery. To restart the 10-minute timer, turn
the exterior lamp control to the
Oposition
and then back to the
;or2position.
To keep the lamps on for more than
10 minutes, the ignition must be on or in
ACC/ACCESSORY.

Buick E2UB-N Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
14583509) - 2021 - CRC - 1/8/21
178 Climate Controls
Climate Controls
Climate Control Systems
Climate Control Systems . . . . . . . . . . . . . . . 178
Dual Automatic Climate ControlSystem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180
Air Vents
Air Vents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184
Maintenance
Passenger Compartment Air Filter . . . . . 184
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185
Climate Control Systems
The heating, cooling, and ventilation for the vehicle can be controlled with this system.
1. Fan Control
2. Recirculation
3. A/C (Air Conditioning)
4. ON/OFF
5. Defrost
6. Rear Window Defogger
7. TEMP (Temperature Control)
8. Air Delivery Mode Controls Manual Operation
ON/OFF :
Press to turn the system off or
on. When off is selected, the system will
prevent outside air from entering the
vehicle. Pressing most climate control
buttons will turn the system on.
]: Turn the knob clockwise or
counterclockwise to increase or decrease the
fan speed.
TEMP : Turn the knob clockwise or
counterclockwise to increase or decrease the
temperature.

Buick E2UB-N Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
14583509) - 2021 - CRC - 1/8/21
180 Climate Controls
Dual Automatic Climate Control System
The heating, cooling, and ventilation for the vehicle can be controlled with this system.
1. Recirculation
2. AUTO (Automatic Operation)
3. ON/OFF
4. CLIMATE
5. Defrost
6. Rear Window Defogger7. A/C (Air Conditioning)
8. Driver and Passenger Heated and
Ventilated Seats (If Equipped)
9. Passenger Temperature Controls
10. Fan Control
11. Driver Temperature Controls
12. SYNC (Synchronized Temperature)
Climate Control Display
1. Driver and Passenger Temperature Displays
2. Fan Control
3. Driver and Passenger Temperature Controls
4. Sync (Synchronized Temperature)
5. Recirculation
6. Air Delivery Mode Control
7. Auto (Automatic Operation)
8. A/C (Air Conditioning)
9. On/Off (Power)

Buick E2UB-N Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
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Driving and Operating 191
.Ease your foot off the accelerator pedal
and steer the way you want the vehicle
to go. The vehicle may straighten out. Be
ready for a second skid if it occurs.
.Slow down and adjust your driving
according to weather conditions. Stopping
distance can be longer and vehicle control
can be affected when traction is reduced
by water, snow, ice, gravel, or other
material on the road. Learn to recognize
warning clues—such as enough water,
ice, or packed snow on the road to make
a mirrored surface —and slow down
when you have any doubt.
.Try to avoid sudden steering, acceleration,
or braking, including reducing vehicle
speed by shifting to a lower gear. Any
sudden changes could cause the tires to
slide.
Remember: Antilock brakes help avoid only
the braking skid.
Driving on Wet Roads
Rain and wet roads can reduce vehicle
traction and affect your ability to stop and
accelerate. Always drive slower in these
types of driving conditions and avoid driving
through large puddles and deep-standing or
flowing water.
{Warning
Wet brakes can cause crashes. They
might not work as well in a quick stop
and could cause pulling to one side. You
could lose control of the vehicle.
After driving through a large puddle of
water or a car/vehicle wash, lightly apply
the brake pedal until the brakes work
normally.
Flowing or rushing water creates strong
forces. Driving through flowing water
could cause the vehicle to be carried
away. If this happens, you and other
vehicle occupants could drown. Do not
ignore police warnings and be very
cautious about trying to drive through
flowing water.
Hydroplaning
Hydroplaning is dangerous. Water can build
up under the vehicle's tires so they actually
ride on the water. This can happen if the
road is wet enough and you are going fast
enough. When the vehicle is hydroplaning, it
has little or no contact with the road. There is no hard and fast rule about
hydroplaning. The best advice is to slow
down when the road is wet.
Other Rainy Weather Tips
Besides slowing down, other wet weather
driving tips include:
.Allow extra following distance.
.Pass with caution.
.Keep windshield wiping equipment in
good shape.
.Keep the windshield washer fluid reservoir
filled.
.Have good tires with proper tread depth.
See
Tires 0278.
.Turn off cruise control.
Hill and Mountain Roads
Driving on steep hills or through mountains
is different than driving on flat or rolling
terrain. Tips include:
.Keep the vehicle serviced and in good
shape.
.Check all fluid levels and brakes, tires,
cooling system, and transmission.
.Shift to a lower gear when going down
steep or long hills.

Buick E2UB-N Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
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246 Driving and Operating
Parking on Hills
{Warning
To prevent serious injury or death,
always park your vehicle and trailer on a
level surface when possible.
When parking your vehicle and your trailer
on a hill: 1. Press the brake pedal, but do not shift into P (Park) yet. Turn the wheels into
the curb if facing downhill or into traffic
if facing uphill.
2. Have someone place chocks under the trailer wheels.
3. When the wheel chocks are in place, gradually release the brake pedal to
allow the chocks to absorb the load of
the trailer.
4. Reapply the brake pedal. Then apply the parking brake and shift into P (Park).
5. Release the brake pedal.
Leaving After Parking on a Hill
1. Apply and hold the brake pedal.
.Start the engine.
.Shift into a gear.
.Release the parking brake. 2. Let up on the brake pedal.
3. Drive slowly until the trailer is clear of
the chocks.
4. Stop and have someone pick up and store the chocks.
Maintenance When Trailer Towing
The vehicle needs service more often when
used to tow trailers. See Maintenance
Schedule 0314. It is especially important to
check the automatic transmission fluid,
engine oil, axle lubricant, belts, cooling
system, and brake system before and during
each trip.
Check periodically that all nuts and bolts on
the trailer hitch are tight.
Engine Cooling When Trailer Towing
The cooling system may temporarily
overheat during severe operating conditions.
See Engine Overheating 0265.
Trailer Towing
Caution
Towing a trailer improperly can damage
the vehicle and result in costly repairs
not covered by the vehicle warranty. To
(Continued)
Caution (Continued)
tow a trailer correctly, follow the
directions in this section and see your
dealer for important information about
towing a trailer with the vehicle.
Trailer Weight
{Warning
Never exceed the towing capacity for
your vehicle.
Safe trailering requires monitoring the
weight, speed, altitude, road grades, outside
temperature, dimensions of the front of the
trailer, and how frequently the vehicle is
used to tow a trailer.
When towing a trailer, the combined weight
of the vehicle, vehicle contents, trailer, and
trailer contents must be below all of the
maximum weight ratings for the vehicle,
including:
.GCWR: Gross Combined Weight Rating
.GVWR: Gross Vehicle Weight Rating
.Maximum Trailer Weight Rating
.Maximum Trailer Tongue Weight Rating

Buick E2UB-N Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
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248 Driving and Operating
VehicleMaximum Trailer Weight GCWR* Maximum Tongue Weight
2.0L L4 Gas Engine (LSY) with Heavy Duty Cooling
System 680 kg (1500 lb) 3 600 kg (7,936 lb) 159 kg (350 lb)
*The Gross Combination Weight Rating (GCWR) is the total allowable weight of the completely loaded vehicle and trailer including any
passengers, cargo, equipment, and conversions. The GCWR for the vehicle should not be exceeded.
Maximum Trailer Tongue Weight Rating
The Maximum Trailer Tongue Weight Rating
is the allowable trailer tongue weight that
the vehicle can support using a conventional
trailer hitch. It may be necessary to reduce
the overall trailer weight to stay within the
maximum trailer tongue weight rating while
still maintaining the correct trailer load
balance.
The trailer tongue weight contributes to the
Gross Vehicle Weight (GVW). GVW includes
the curb weight of your vehicle, any
passengers, cargo, equipment and the trailer
tongue weight. Vehicle options, passengers,
cargo, and equipment reduce the maximum
allowable tongue weight the vehicle can
carry, which also reduces the maximum
allowable trailer weight.
Trailer Load Balance
The correct trailer load balance must be
maintained to ensure trailer stability.
Incorrect load balance is a leading cause of
trailer sway.
The trailer tongue weight (1) should be 10–
15% of the loaded trailer weight (2). Some
specific trailer types, such as boat trailers,

Buick E2UB-N Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
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Vehicle Care 253
Vehicle Care
General Information
General Information . . . . . . . . . . . . . . . . . . . 254
California Proposition 65 Warning . . . . . 254
California Perchlorate MaterialsRequirements . . . . . . . . . . . . . . . . . . . . . . . . 254
Accessories and Modifications . . . . . . . . . 254
Vehicle Checks
Doing Your Own Service Work . . . . . . . . . 255
Hood . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 255
Engine Compartment Overview . . . . . . . . 257
Engine Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 258
Engine Oil Life System . . . . . . . . . . . . . . . . 260
Automatic Transmission Fluid . . . . . . . . . 260
Engine Air Filter Life System . . . . . . . . . . . 261
Engine Air Cleaner/Filter . . . . . . . . . . . . . . . 261
Cooling System . . . . . . . . . . . . . . . . . . . . . . . 262
Engine Overheating . . . . . . . . . . . . . . . . . . . 265
Washer Fluid . . . . . . . . . . . . . . . . . . . . . . . . . . 266
Brakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 266
Brake Fluid . . . . . . . . . . . . . . . . . . . . . . . . . . . . 267
Battery - North America . . . . . . . . . . . . . . . 268
All-Wheel Drive . . . . . . . . . . . . . . . . . . . . . . . 269
Park Brake and P (Park) Mechanism Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 269
Wiper Blade Replacement . . . . . . . . . . . . . 269
Windshield Replacement . . . . . . . . . . . . . . 270
Gas Strut(s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 271
Headlamp Aiming
Front Headlamp Aiming . . . . . . . . . . . . . . . 272
Bulb Replacement
Bulb Replacement . . . . . . . . . . . . . . . . . . . . . 272
LED Lighting . . . . . . . . . . . . . . . . . . . . . . . . . . . 272
Electrical System
Electrical System Overload . . . . . . . . . . . . . 272
Fuses and Circuit Breakers . . . . . . . . . . . . . 273
Engine Compartment Fuse Block . . . . . . . 273
Instrument Panel Fuse Block . . . . . . . . . . 276
Wheels and Tires
Tires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 278
All-Season Tires . . . . . . . . . . . . . . . . . . . . . . . . 279
Winter Tires . . . . . . . . . . . . . . . . . . . . . . . . . . . 279
Tire Sidewall Labeling . . . . . . . . . . . . . . . . . 280
Tire Designations . . . . . . . . . . . . . . . . . . . . . . 281
Tire Terminology and Definitions . . . . . . 282
Tire Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . 284
Tire Pressure for High-Speed Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . 285
Tire Pressure Monitor System . . . . . . . . . 286
Tire Pressure Monitor Operation . . . . . . . 287
Tire Inspection . . . . . . . . . . . . . . . . . . . . . . . . 289
Tire Rotation . . . . . . . . . . . . . . . . . . . . . . . . . . 289
When It Is Time for New Tires . . . . . . . . 290
Buying New Tires . . . . . . . . . . . . . . . . . . . . . . 291
Different Size Tires and Wheels . . . . . . . 292
Uniform Tire Quality Grading . . . . . . . . . 293 Wheel Alignment and Tire Balance . . . . 294
Wheel Replacement . . . . . . . . . . . . . . . . . . . 294
Tire Chains . . . . . . . . . . . . . . . . . . . . . . . . . . . . 295
If a Tire Goes Flat . . . . . . . . . . . . . . . . . . . . . 295
Tire Changing . . . . . . . . . . . . . . . . . . . . . . . . . 296
Compact Spare Tire . . . . . . . . . . . . . . . . . . . . 301
Jump Starting
Jump Starting - North America . . . . . . . . 302
Towing the Vehicle
Towing the Vehicle . . . . . . . . . . . . . . . . . . . 304
Recreational Vehicle Towing . . . . . . . . . . . 304
Appearance Care
Exterior Care . . . . . . . . . . . . . . . . . . . . . . . . . . 305
Interior Care . . . . . . . . . . . . . . . . . . . . . . . . . . 309
Floor Mats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 311

Buick E2UB-N Owner Manual (GMNA-Localizing-U.S./Canada/Mexico-
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258 Vehicle Care
1.Engine Air Cleaner/Filter 0261.
2. Engine Oil Fill Cap. See Engine Oil0258.
3. Engine Oil Dipstick. See Engine Oil0258.
4. Engine Cooling Fan (Out of View). See Cooling System 0262.
5. Brake Fluid Reservoir. See Brake Fluid
0 267.
6. Battery - North America 0268.
7. Engine Coolant Surge Tank and Pressure Cap. See Cooling System 0262.
8. Positive (+) Battery Terminal (Under Cover). See Jump Starting - North
America 0302.
9. Windshield Washer Fluid Reservoir. See Washer Fluid 0266.
10. Engine Compartment Fuse Block 0273.
11. Remote Negative (-) Battery Terminal. SeeJump Starting - North America 0302.
Engine Oil
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:
.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. SeeEngine Oil Life System 0260.
.Always dispose of engine oil properly. See
“What to Do with Used Oil” in this
section.
Checking Engine Oil
Check the engine oil level regularly, every
650 km (400 mi), especially prior to a long
trip. The engine oil dipstick handle is a loop.
See Engine Compartment Overview 0257 for
the location.
{Warning
The engine oil dipstick handle may be
hot; it could burn you. Use a towel or
glove to touch the dipstick handle.
If a low oil Driver Information Center (DIC)
message displays, check the oil level. Follow these guidelines:
.To get an accurate reading, park the
vehicle on level ground. Check the engine
oil level after the engine has been off for
at least two hours. Checking the engine
oil level on steep grades or too soon after
engine shutoff can result in incorrect
readings. Accuracy improves when
checking a cold engine prior to starting.
Remove the dipstick and check the level.
.If unable to wait two hours, the engine
must be off for at least 15 minutes if the
engine is warm, or at least 30 minutes if
the engine is not warm. Pull out the
dipstick, 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 and the engine has
been off for at least 15 minutes, add 1 L