cooling CHEVROLET TAHOE 2011 3.G Owners Manual

Black plate (8,1)Chevrolet Tahoe and GMC Yukon/Yukon Denali Hybrid - 2011
5-8 Instruments and Controls
Engine Coolant
Temperature Gauge
United States
Canada
This gauge shows the engine
coolant temperature.
It also provides an indicator of how
hard the vehicle is working. During a
majority of the operation, the gauge
reads 100°C (210°F) or less. If a
load is being pulled or going up
hills, it is normal for the temperature
to fluctuate and go over the 113°C
(235°F) mark. However, if the gauge
reaches the 125°C (260°F) mark, it
indicates that the cooling system is
working beyond its capacity.
Charging System Light
This 12‐volt battery light comes on
briefly when the ignition is turned to
ON/RUN, but the engine is not
running, as a check to show it is
working.
It should go out once the engine
has been started. If it stays on,
or comes on while driving, there
could be a problem with the 12‐volt
charging system. Have the vehicle
serviced by your dealer. A 12‐volt
charging system Driver Information
Center (DIC) message may also
appear. See Driver Information
Center (DIC) on page 5‑11 for more
information. This light could indicate
that there are electrical problems.

Black plate (1,1)Chevrolet Tahoe and GMC Yukon/Yukon Denali Hybrid - 2011
Vehicle Care 10-1
Vehicle Care
Vehicle Checks
Doing Your OwnService Work . . . . . . . . . . . . . . . 10-2
Engine Compartment Overview . . . . . . . . . . . . . . . . . . . 10-4
Automatic Transmission Fluid . . . . . . . . . . . . . . . . . . . . . . . 10-6
Drive Motor/Generator Control Module (DMCM) Coolant
Surge Tank
Pressure Cap . . . . . . . . . . . . . . 10-9
Drive Motor/Generator Control Module (DMCM) Cooling
System . . . . . . . . . . . . . . . . . . . . . 10-9
Power Steering Fluid . . . . . . . 10-12
Battery . . . . . . . . . . . . . . . . . . . . . 10-12
Bulb Replacement
Bulb Replacement . . . . . . . . . . 10-13
Taillamps, Turn Signal, Stoplamps, and Back-Up
Lamps . . . . . . . . . . . . . . . . . . . . 10-13
Replacement Bulbs . . . . . . . . . 10-14
Electrical System
High Voltage Devices and
Wiring . . . . . . . . . . . . . . . . . . . . . 10-14
Fuses and Circuit Breakers . . . . . . . . . . . . . . . . . . 10-15
Engine Compartment Fuse Block . . . . . . . . . . . . . . . . . . . . . 10-15
Wheels and Tires
Tire Pressure . . . . . . . . . . . . . . . 10-17
Tire Pressure MonitorOperation . . . . . . . . . . . . . . . . . 10-18
Tire Rotation . . . . . . . . . . . . . . . 10-21
Tire Chains . . . . . . . . . . . . . . . . . 10-22 If a Tire Goes Flat . . . . . . . . . . 10-22
Tire Sealant and
Compressor Kit . . . . . . . . . . . 10-24
Storing the Tire Sealant and Compressor Kit . . . . . . . . . . . 10-31
Jump Starting
Jump Starting . . . . . . . . . . . . . . 10-32
Towing
Recreational Vehicle
Towing . . . . . . . . . . . . . . . . . . . . 10-36
Appearance Care
Exterior Care . . . . . . . . . . . . . . . 10-40

Black plate (5,1)Chevrolet Tahoe and GMC Yukon/Yukon Denali Hybrid - 2011
Vehicle Care 10-5
A. See“Engine Air Cleaner/Filter”
in the owner manual.
B. Drive Motor/Generator Control Module (DMCM). See Drive
Motor/Generator Control
Module (DMCM) Cooling
System on page 10‑9.
C. Engine Oil Dipstick (Out of View). See “Engine Oil” in the
owner manual.
D. Automatic Transmission Fluid Dipstick. See Automatic
Transmission Fluid on
page 10‑6. E. Brake Fluid Reservoir. See
“Brakes” in the owner manual.
F. See “Engine Compartment Fuse
Block” in the owner manual.
G. Windshield Washer Fluid Reservoir. See “Washer Fluid”
in the owner manual.
H. Hybrid Auxiliary Fuse Block (Out of View). See Engine
Compartment Fuse Block on
page 10‑15. I. DMCM Coolant Surge Tank
Pressure Cap. See Drive Motor/
Generator Control Module
(DMCM) Coolant Surge Tank
Pressure Cap on page 10‑9.
J. Coolant Surge Tank Pressure Cap. See “Engine Coolant” in
the owner manual.
K. Engine Oil Fill Cap (Out of View). See “Engine Oil” in the
owner manual.

Black plate (9,1)Chevrolet Tahoe and GMC Yukon/Yukon Denali Hybrid - 2011
Vehicle Care 10-9
Drive Motor/Generator
Control Module (DMCM)
Coolant Surge Tank
Pressure Cap
SeeEngine Compartment Overview
on page 10‑4 for more information
on location.
The Drive Motor/Generator Control
Module (DMCM) coolant surge tank
pressure cap must be fully installed
on the hybrid coolant surge tank.
Notice: If the pressure cap is not
tightly installed, coolant loss and
possible damage to the Drive
Motor/Generator Control
Module (DMCM) may occur. Be
sure the cap is properly and
tightly secured.
Drive Motor/Generator
Control Module (DMCM)
Cooling System
In addition to the regular cooling
system, the vehicle also has a
cooling system for the DMCM
system. This system is serviced
differently than the vehicle's main
cooling system. The DMCM cooling
system includes the DMCM coolant
surge tank, DMCM surge tank
pressure cap, DMCM cooling
pumps, hybrid cooling radiator and
the Drive Motor/Generator Control
Module (DMCM). The DMCM
cooling system uses a 50/50
pre-mixed DEX-COOL
®coolant and
deionized water available at your
dealer. See “Engine Coolant” and
“Cooling System” in the owner
manual for more information.
When it is safe to lift the hood:
A. Drive Motor/Generator Control Module (DMCM)
B. Engine Coolant Surge Tank Pressure Cap
C. DMCM Coolant Surge Tank/ Engine Coolant Surge Tank
D. DMCM Cooling Hoses (Out of View)
E. DMCM Coolant Tank Pressure Cap

Black plate (10,1)Chevrolet Tahoe and GMC Yukon/Yukon Denali Hybrid - 2011
10-10 Vehicle Care
If the coolant inside the DMCM
coolant surge tank is boiling, do not
do anything else until it cools down.
The coolant level should be at or
above the FULL COLD mark with
the vehicle parked on a level
surface. If it is not, there might be a
leak at the DMCM cooler core,
DMCM pressure cap, DMCM cooler
hoses, DMCM cooling pump or
somewhere else in the DMCM
cooling system.Notice:
Running the engine when
there is a leak in the hybrid
cooling system can cause the
hybrid cooling system to lose all
coolant and can damage the
system. Get any leak fixed before
you drive the vehicle or run the
engine.
How to Add Coolant to the
DMCM Coolant Surge Tank
If no problem has been found yet,
check to see if coolant is visible in
the DMCM coolant surge tank. If coolant is visible, add pre‐mixed
DEX-COOL coolant, available at
your dealer, at the DMCM coolant
surge tank, but be sure the DMCM
cooling system, including the DMCM
coolant surge tank pressure cap, is
cool before you do it. Use the
procedure following.
{WARNING
Steam and scalding liquids from a
hot cooling system can blow out
and burn you badly. They are
under pressure, and if you turn
the coolant surge tank pressure
cap
—even a little —they can
come out at high speed. Never
turn the cap when the cooling
system, including the coolant
surge tank pressure cap, is hot.
Wait for the cooling system and
coolant surge tank pressure cap
to cool if you ever have to turn
the pressure cap.

Black plate (11,1)Chevrolet Tahoe and GMC Yukon/Yukon Denali Hybrid - 2011
Vehicle Care 10-11
Notice:Using coolant other than
a pre‐mixed DEX-COOL, available
at your dealer, may damage your
vehicle. Any repairs would not be
covered by your warranty. Always
use a pre‐mixed DEX-COOL
(silicate-free) coolant in your
vehicle.
{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.
If the DMCM coolant is empty, the
vehicle must be serviced by your
dealer and a special fill procedure
must be followed.
Notice: Attempting to fill the
DMCM cooling surge tank
yourself when the fluid level is
empty can damage your vehicle.
Your vehicle must be serviced.
1. Park the vehicle on a level surface and turn the vehicle off.
Remove the DMCM coolant
surge tank pressure cap when
the DMCM cooling system,
including the DMCM coolant
surge tank pressure cap and
DMCM cooling hoses, are no
longer hot. Turn the DMCM
coolant surge tank pressure cap
slowly counterclockwise (left)
about one full turn. Wait
30 seconds.2. Then keep turning the DMCMcoolant surge tank pressure cap
slowly, and remove it.
3. Add the pre‐mixed DEX‐COOL, available at your dealer, to the
DMCM coolant surge tank until
the level reaches the FULL
COLD mark.
4. Turn the ignition to ON/RUN without starting the engine. The
hybrid cooling pumps will run
and any trapped air will purge to
the surge tank.

Black plate (12,1)Chevrolet Tahoe and GMC Yukon/Yukon Denali Hybrid - 2011
10-12 Vehicle Care
5. Add the pre‐mixed DEX‐COOL,available at your dealer, until the
coolant level is maintained at the
FULL COLD mark. This should
take no longer than two minutes
of hybrid cooling pump
operation.
If the level cannot be kept at the
FULL COLD level, the vehicle
may need service. See your
dealer.
6. Then replace the DMCM coolant
surge tank pressure cap. Be
sure the pressure cap is
hand-tight and fully seated. Notice:
Using tap water, cooling
system sealers or conditioners in
an attempt to stop coolant leaks
can damage the DMCM and
engine cooling systems. Never
use tap water, cooling system
sealers or conditioners in your
cooling system.
Power Steering Fluid
The vehicle has electric power
steering and does not use power
steering fluid.
Battery
This vehicle has a standard 12‐volt
battery and a high voltage hybrid
battery.
Refer to the replacement number on
the original battery label when a
new standard 12‐volt battery is
needed. Only a trained service technician
with the proper knowledge and tools
should inspect, test, or replace the
hybrid battery. See your dealer if the
hybrid battery needs service. The
dealer has information on how to
recycle the hybrid battery. There
is also information available at
http://www.recyclemybattery.com.
If an airbag inflates or the vehicle
has been in a crash, the vehicle's
sensing system might command the
automatic hybrid battery disconnect
to open. See
Replacing Airbag
System Parts After a Crash on
page 3‑2 for more information.
{DANGER
Battery posts, terminals, and
related accessories contain lead
and lead compounds, chemicals
known to the State of California to
cause cancer and reproductive
harm. Wash hands after handling.

Black plate (16,1)Chevrolet Tahoe and GMC Yukon/Yukon Denali Hybrid - 2011
10-16 Vehicle Care
FusesUsage
1 ACPO (SUV Only)
2 BECM FAN
3 ACCM
4 CAB HTR PMP Fuses
Usage
5 EMPTY
6 COOL PUMP
7 EPS
8 Drive Motor/Generator
Control Module 1 Fuses
Usage
9 Drive Motor/Generator
Control Module 2
10 BECM
J‐Case Usage
FAN 1 Cooling Fan 1
TRANS PUMP Auxiliary
Transmission Fluid Pump
FAN 2 Cooling Fan 2
CAB
HTR PMP Cab Heater Pump
Relays Usage
CAB
HTR
PUMP Cabin Heater Pump
COOL
PUMP Coolant Pump
FAN LOW Cooling Fan Low
Speed Relay

Black plate (17,1)Chevrolet Tahoe and GMC Yukon/Yukon Denali Hybrid - 2011
Vehicle Care 10-17
RelaysUsage
FAN
MID 1 Cooling Fan Mid 1
FAN HI Cooling Fan High
Speed Relay
FAN
MID 2 Cooling Fan Mid 2
FAN
CNTRL Cooling Fan ControlWheels and Tires
Tire Pressure
Tires need the correct amount of air
pressure to operate effectively.
Notice:
Do not let anyone tell
you that under‐inflation or
over‐inflation is all right. It is
not. If your tires do not have
enough air (under‐inflation),
you can get the following:
.Tire overloading and
over-heating which could
lead to a blowout.
.Premature or
irregular wear.
.Poor handling.
.Reduced fuel economy. If your tires have too much air
(over‐inflation), you can get
the following:
.Unusual wear.
.Poor handling.
.Rough ride.
.Needless damage from
road hazards.
A vehicle specific Tire and Loading
Information label is attached to your
vehicle. This label shows your
vehicle's original equipment tires
and the correct inflation pressures
for your tires when they are cold.
The recommended cold tire inflation
pressure, shown on the label, is the
minimum amount of air pressure
needed to support your vehicle's
maximum load carrying capacity.
For additional information regarding
how much weight your vehicle can
carry, and an example of the Tire
and Loading Information label, see
“Vehicle Load Limits”
in the owner
manual. How you load your vehicle

Black plate (2,1)Chevrolet Tahoe and GMC Yukon/Yukon Denali Hybrid - 2011
11-2 Service and Maintenance
UsageFluid/Lubricant
Drive Motor/Generator Control
Module (DMCM) Cooling System Always use the pre-mixed 50/50 mixture of de‐ionized water and
DEX-COOL
®(silicate-free) coolant available at your dealer. See
Drive
Motor/Generator Control Module (DMCM) Cooling System on page 10‑9.