2010 CHEVROLET SUBURBAN engine overheat

4. With the coolant surge tank pressure cap off, startthe engine and let it run until you can feel the
upper radiator hose getting hot. Watch out for the
engine cooling fan.
By this time, the coolant level inside the coolant
surge tank may be lower. If the level is lower, add
more of the proper mixture to the coolant surge
tank until the level reaches the FULL COLD mark. 5. Replace the pressure cap. Be sure the pressure
cap is hand-tight and fully seated.
6. Verify coolant level after engine is shut off and the coolant is cold. If necessary, repeat coolant fill
procedure Steps 1 through 6.
Notice: 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
The vehicle has several indicators to warn of engine
overheating.
There is a coolant temperature gauge on your vehicle's
instrument panel. See Engine Coolant Temperature
Gauge on page 4‑38.
In addition, ENGINE OVERHEATED STOP ENGINE,
ENGINE OVERHEATED IDLE ENGINE, and a ENGINE
POWER IS REDUCED message comes on in the Driver
Information Center (DIC) on the instrument panel. See
DIC Warnings and Messages on page 4‑61.
6-36

You may decide not to lift the hood when this warning
appears, but instead get service help right away. See
Roadside Assistance Program on page 8‑7.
If you do decide to lift the hood, make sure the vehicle
is parked on a level surface.
Then check to see if the engine cooling fans are
running. If the engine is overheating, both fans should
be running. If they are not, do not continue to run the
engine and have the vehicle serviced.
Notice:Engine damage from running your engine
without coolant is not covered by the vehicle
warranty. See Overheated Engine Protection
Operating Mode for information on driving to a safe
place in an emergency.
Notice: If the engine catches fire while driving with
no coolant, the vehicle can be badly damaged. The
costly repairs would not be covered by the vehicle
warranty. See Overheated Engine Protection
Operating Mode
on page 6‑39for information on
driving to a safe place in an emergency.
If Steam Is Coming From The Engine
Compartment
{WARNING:
Steam from an overheated engine can burn you
badly, even if you just open the hood. Stay away
from the engine if you see or hear steam coming
from it. Turn it off and get everyone away from the
vehicle until it cools down. Wait until there is no
sign of steam or coolant before you open
the hood.
If you keep driving when the vehicles engine is
overheated, the liquids in it can catch fire. You or
others could be badly burned. Stop the engine if it
overheats, and get out of the vehicle until the
engine is cool.
See Overheated Engine Protection Operating
Mode
on page 6‑39for information on driving to
a safe place in an emergency.
6-37

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 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.
.Tows a trailer. SeeTowing a Trailer on page 5‑47. 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. In heavy traffic, let the engine idle in N (Neutral) while stopped. If 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 slow for about 10 minutes. Keep a safe
vehicle distance from the car in front of you. If the
warning does not come back on, continue to drive
normally.
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. Also,
see “Overheated Engine Protection Operating Mode”
later in this section.
6-38

Overheated Engine Protection
Operating Mode
If an overheated engine condition exists and the
ENGINE POWER IS REDUCED message is displayed,
an overheat protection mode which alternates firing
groups of cylinders helps prevent engine damage. In
this mode, you will notice a loss in power and engine
performance. This operating mode allows the vehicle to
be driven to a safe place in an emergency. Driving
extended miles (km) and/or towing a trailer in the
overheat protection mode should be avoided.
Notice:After driving in the overheated engine
protection operating mode, to avoid engine damage,
allow the engine to cool before attempting any
repair. The engine oil will be severely degraded.
Repair the cause of coolant loss, change the oil
and reset the oil life system. See Engine Oil
on
page 6‑17.
Engine Fan Noise
If the vehicle has a clutched engine cooling fan, when
the clutch is engaged, the fan spins faster to provide
more air to cool the engine. In most everyday driving
conditions, the fan is spinning slower and the clutch is
not fully engaged. This improves fuel economy and
reduces fan noise. Under heavy vehicle loading, trailer
towing, and/or high outside temperatures, the fan speed
increases as the clutch more fully engages, so you may
hear an increase in fan noise. This is normal and should
not be mistaken as the transmission slipping or making
extra shifts. It is merely the cooling system functioning
properly. The fan will slow down when additional cooling
is not required and the clutch disengages.
You may also hear this fan noise when you start the
engine. It will go away as the fan clutch partially
disengages.
If the vehicle has electric cooling fans, you may hear
the fans spinning at low speed during most everyday
driving. The fans may turn off if no cooling is required.
Under heavy vehicle loading, trailer towing, and/or high
outside temperatures, or if you are operating the air
conditioning system, the fans may change to high
speed and you may hear an increase in fan noise.
This is normal and indicates that the cooling system is
functioning properly. The fans will change to low speed
when additional cooling is no longer required.
6-39

Engine (cont.)Coolant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-31
Coolant Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-30
Coolant Temperature Gauge . . . . . . . . . . . . . . . . . . . . . . 4-38
Cooling System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-30
Drive Belt Routing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-15
Exhaust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-50
Fan Noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-39
Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-17
Overheated Protection Operating Mode . . . . . . . . . . 6-39
Overheating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-36
Starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-28
Engine Oil Life System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-20
Entry Lighting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15
Event Data Recorders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-18
Exit Lighting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15
Extender, Safety Belt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-55
Exterior Lamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11
F
Filter Engine Air Cleaner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-21
Finish Damage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-115
Flash-to-Pass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-5 Flashers, Hazard Warning . . . . . . . . . . . . . . . . . . . . . . . . . . .4-3
Flat Tire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-87
Flat Tire, Changing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-88
Flat Tire, Storing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-104
Fluid
Automatic Transmission . . . . . . . . . . . . . . . . . . . . 6-23, 6-26
Power Steering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-40
Windshield Washer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-41
Fog Lamps Bulb Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13
Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-44
Four-Wheel Drive . . . . . . . . . . . . . . . . . . . . . . 3-39, 3-44, 6-53
Front Axle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-54
Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-6 Additives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8
California Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8
E85 (85% Ethanol) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-9
Filling a Portable Fuel Container . . . . . . . . . . . . . . . . . . 6-13
Filling the Tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-11
Fuels in Foreign Countries . . . . . . . . . . . . . . . . . . . . . . . . 6-10
Gasoline Octane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7
Gasoline Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7
Gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-45
Low Fuel Warning Light . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-46
Management, Active . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-31
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N
Navigation System, Privacy . . . . . . . . . . . . . . . . . . . . . . . . 8-19
Navigation/Radio System, see NavigationManual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-114
New Vehicle Break-In . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-26
O
Object Detection, Side Blind Zone Alert (SBZA) . . . 3-58
Odometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-31 Trip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-31
Off-Road . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-11 Driving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-11
Recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-10
Oil Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-17
Engine Oil Life System . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-20
Pressure Gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-42
Pressure Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-43
Older Children, Restraints . . . . . . . . . . . . . . . . . . . . . . . . . 2-55
Online Owner Center . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-5
OnStar, Privacy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-19
OnStar
®System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-30
Operation, Universal Home Remote System . . . . . . . 3-66
Outlet Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-26
Outlets
Accessory Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16 Outside
Automatic Dimming Mirror . . . . . . . . . . . . . . . . . . . . . . . . 3-55
Convex Mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-55
Heated Mirrors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-56
Manual Mirrors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-52
Power Foldaway Mirrors . . . . . . . . . . . . . . . . . . . . . . . . . . 3-54
Power Mirrors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-53
Towing Mirrors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-53
Overheated Engine Protection Operating Mode . . . . 6-39
Owner Checks and Services . . . . . . . . . . . . . . . . . . . . . . . 7-10
Owners, Canadian . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii
P
Paint, Damage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-115
Park Shifting Into . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-47
Shifting Out of . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-49
Park Aid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-56
Park Tilt Mirrors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-55
Parking
Assist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-56
Brake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-46
Over Things That Burn . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-49
PASS-Key
®III+ Electronic Immobilizer . . . . . . . . . . . . . 3-24
PASS-Key®III+ Electronic Immobilizer
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-24
i - 10