2004 CHEVROLET SILVERADO coolant reservoir

Engine Coolant Heater
In very cold weather,
0°F (−18°C) or colder, the
engine coolant heater
can help. You’ll get easier
starting and better fuel
economy during engine
warm-up. Usually, the
coolant heater should be
plugged in a minimum
of four hours prior to
starting your vehicle.
At temperatures above 32°F (0°C), use of the coolant
heater is not required.
To Use the Engine Coolant Heater
1. Turn off the engine.
2. Open the hood and unwrap the electrical cord. The
cord is located on the driver’s side of the engine
compartment, near the power steering uid
reservoir. If you have a diesel engine, refer to
diesel supplement for location.
3. Plug it into a normal, grounded 110-volt AC outlet.
{CAUTION:
Plugging the cord into an ungrounded outlet
could cause an electrical shock. Also, the
wrong kind of extension cord could overheat
and cause a re. You could be seriously
injured. Plug the cord into a properly grounded
three-prong 110-volt AC outlet. If the cord will
not reach, use a heavy-duty three-prong
extension cord rated for at least 15 amps.
2-26

A. Engine Air Cleaner/Filter. SeeEngine Air
Cleaner/Filter on page 5-25.
B. Coolant Surge Tank. SeeEngine Coolant on
page 5-35.
C. Air Filter Restriction Indicator (If Equipped). See
Engine Air Cleaner/Filter on page 5-25.
D. Engine Oil Dipstick. SeeEngine Oil on page 5-20.
E. Automatic Transmission Dipstick (If equipped).
SeeAutomatic Transmission Fluid (Except Allison
Transmission
®) on page 5-27orAutomatic
Transmission Fluid (Allison Transmission®)on
page 5-30.
F. Fan. SeeCooling System on page 5-41.
G. Engine Oil Fill. SeeEngine Oil on page 5-20.H. Power Steering Fluid Reservoir. SeePower Steering
Fluid on page 5-46.
I. Remote Negative (−) Terminal (GND). SeeJump
Starting on page 5-53.
J. Remote Positive (+) Terminal. SeeJump Starting on
page 5-53.
K. Brake Fluid Reservoir. SeeBrakes on page 5-49.
L. Clutch Fluid Reservoir (If Equipped). SeeHydraulic
Clutch on page 5-34.
M. Underhood Fuse Block. SeeFuses and Circuit
Breakers on page 5-123.
N. Battery. SeeBattery on page 5-52.
O. Windshield Washer Fluid Reservoir. SeeWindshield
Washer Fluid on page 5-47.
5-15

A. Engine Air Cleaner/Filter. SeeEngine Air
Cleaner/Filter on page 5-25.
B. Coolant Surge Tank. SeeEngine Coolant on
page 5-35.
C. Air Filter Restriction Indicator (If Equipped). See
Engine Air Cleaner/Filter on page 5-25.
D. Engine Oil Dipstick. SeeEngine Oil on page 5-20.
E. Automatic Transmission Dipstick (If Equipped).
SeeAutomatic Transmission Fluid (Except Allison
Transmission
®) on page 5-27orAutomatic
Transmission Fluid (Allison Transmission®)on
page 5-30.
F. Engine Oil Fill. SeeEngine Oil on page 5-20.
G. Fan. SeeCooling System on page 5-41.H. Remote Negative (−) Terminal (GND). SeeJump
Starting on page 5-53.
I. Power Steering Fluid Reservoir. SeePower Steering
Fluid on page 5-46.
J. Remote Positive (+) Terminal. SeeJump Starting on
page 5-53.
K. Brake Fluid Reservoir. SeeBrakes on page 5-49.
L. Clutch Fluid Reservoir (If Equipped). SeeHydraulic
Clutch on page 5-34.
M. Underhood Fuse Block. SeeFuses and Circuit
Breakers on page 5-123.
N. Battery. SeeBattery on page 5-52.
O. Windshield Washer Fluid Reservoir. SeeWindshield
Washer Fluid on page 5-47.
5-17

A. Engine Air Cleaner/Filter. SeeEngine Air
Cleaner/Filter on page 5-25.
B. Coolant Surge Tank. SeeEngine Coolant on
page 5-35.
C. Air Filter Restriction Indicator (If Equipped). See
Engine Air Cleaner/Filter on page 5-25.
D. Engine Oil Dipstick. SeeEngine Oil on page 5-20.
E. Automatic Transmission Dipstick (If Equipped).
SeeAutomatic Transmission Fluid (Except Allison
Transmission
®) on page 5-27orAutomatic
Transmission Fluid (Allison Transmission®)on
page 5-30.
F. Engine Oil Fill. SeeEngine Oil on page 5-20.
G. Fan. SeeCooling System on page 5-41.H. Remote Negative (−) Terminal (GND). SeeJump
Starting on page 5-53.
I. Remote Positive (+) Terminal. SeeJump Starting on
page 5-53.
J. Power Steering Fluid Reservoir. SeePower Steering
Fluid on page 5-46.
K. Brake Fluid Reservoir. SeeBrakes on page 5-49.
L. Clutch Fluid Reservoir (If Equipped). SeeHydraulic
Clutch on page 5-34.
M. Underhood Fuse Block. SeeFuses and Circuit
Breakers on page 5-123.
N. Battery. SeeBattery on page 5-52.
O. Windshield Washer Fluid Reservoir. SeeWindshield
Washer Fluid on page 5-47.
5-19

When to Check and What to Use
The clutch master cylinder
reservoir is located in the
rear of the engine
compartment on the
driver’s side of the vehicle.
SeeEngine Compartment
Overview on page 5-14
for more information
on location.
Refer to the Maintenance Schedule to determine how
often you should check the uid level in your clutch
master cylinder reservoir and for the proper uid. See
Owner Checks and Services on page 6-9and
Recommended Fluids and Lubricants on page 6-13.
How to Check and Add Fluid
The proper uid should be added if the level does not
reach the bottom of the diaphragm when it’s in place in
the reservoir. See the instructions on the reservoir cap.
Engine Coolant
The cooling system in your vehicle is lled with
DEX-COOL®engine coolant. This coolant is designed
to remain in your vehicle for 5 years or 150,000 miles
(240 000 km), whichever occurs rst, if you add only
DEX-COOL
®extended life coolant.
The following explains your cooling system and how to
add coolant when it is low. If you have a problem
with engine overheating, seeEngine Overheating on
page 5-38.
A 50/50 mixture of clean, drinkable water and
DEX-COOL
®coolant will:
Give freezing protection down to−34°F (−37°C).
Give boiling protection up to 265°F (129°C).
Protect against rust and corrosion.
Help keep the proper engine temperature.
Let the warning lights and gages work as
they should.
Notice:Using coolant other than DEX-COOL
®may
cause premature engine, heater core or radiator
corrosion. In addition, the engine coolant may
require changing sooner, at 30,000 miles (50 000 km)
or 24 months, whichever occurs rst. Any repairs
would not be covered by your warranty. Always use
DEX-COOL
®(silicate-free) coolant in your vehicle.
5-35

Adding Washer Fluid
Your vehicle has a low washer uid message that
comes on when the washer uid is low. The message is
displayed for 15 seconds at the start of each ignition
cycle. When the CHECK WASHER FLUID message is
displayed, you will need to add washer uid to the
windshield washer uid reservoir.
The windshield washer
uid reservoir is located in
the engine compartment
toward the front of the
vehicle on the driver’s side.
Open the cap with the washer symbol on it. Add washer
uid until the tank is full.Notice:When using concentrated washer uid,
follow the manufacturer’s instructions for
adding water.
Do not mix water with ready-to-use washer uid.
Water can cause the solution to freeze and
damage your washer uid tank and other parts
of the washer system. Also, water does not
clean as well as washer uid.
Fill your washer uid tank only three-quarters
full when it is very cold. This allows for
expansion if freezing occurs, which could
damage the tank if it is completely full.
Do not use engine coolant (antifreeze) in your
windshield washer. It can damage your washer
system and paint.
5-48