2003 HONDA CIVIC HATCHBACK coolant temperature

The tachometer shows the engine
speed in revolutions per minute
(rpm). To protect the engine f rom
damage, never drive with the
tachometer needle in the red zone.
The needle returns to the bottom
after you turn off the ignition. The
gauge shows the f uel level reading
immediately af ter you turn the ignition switch back ON (II).
This shows the temperature of the
engine’s coolant. During normal
operation, the pointer should rise
from the bottom mark to about the
middle of the gauge. In severe
driving conditions, such as very hot
weather or a long period of uphill
driving, the pointer may rise to the
upper blue zone. If it reaches the red
(Hot) mark, pull saf ely to the side of
the road. Turn to page for
instructions and precautions on
checking the engine’s cooling
system.
This shows how much f uel you have.
It is most accurate when the vehicle
is on level ground. It may show
slightly more or less than the actual
amount when you are driving on
curvy or hilly roads.
232
Gauges
Inst rument s and Cont rolsT achometer
Fuel Gauge Temperature Gauge
64 MAINTENANCE
REQUIRED
INDICATOR
TACHOMETER SPEEDOMETER
TEMPERATURE GAUGE
ODO/TRIPMETER
U.S model shown SELECT/RESET BUTTONFUEL GAUGE
Avoid driving with an extremely low
f uel level. Running out of f uel could
cause the engine to misf ire, damaging
the catalytic converter.

CONT INUED
The f low-through ventilation system
draws in outside air, circulates it
through the interior, then exhausts it
through vents near the hatch.Turn the temperature control dial
all the way to the lef t.
Make sure the A/C is of f .
Select and Fresh Air mode.
Set the f an to the desired speed.
The outside air intakes f or the
heating and cooling system are at
the base of the windshield. Keep
these clear of leaves and other
debris.
It is best to leave the system in Fresh
Air mode under almost all conditions.
Keeping the system in Recirculation
mode, particularly with the A/C of f ,
can cause the windows to fog up.
Switch to Recirculation mode when
you are driving through smoky or
dusty conditions, then switch back to
Fresh Air mode when the condition
clears.
This section covers how to set up the
system controls f or ventilation,
heating, cooling, dehumidif ying, and
def rosting.
The engine must be running f or the
heater and air conditioning to
generate hot and cold air. The heater
uses engine coolant to warm the air.
If the engine is cold, it will be several
minutes bef ore you f eel warm air
coming from the system.
The air conditioning does not rely on
engine temperature.
1. 2. 3.
Heating and Cooling
Comf ort and Convenience Feat ures
Vent ilat ion
How to Use the System
99
MODE CONTROL
DIAL
TEMPERATURE
CONTROL DIAL
FAN CONTROL DIAL RECIRCULATION BUTTON
AIR CONDITIONING
(A/C) BUTTON

When the interior has cooled down
to a more comf ortable temperature,
close the windows and set the
controls as described f or normal
cooling.Air conditioning places an extra load
on the engine. Watch the engine
coolant temperature gauge (see page
) when driving in stop-and-go
traf f ic or climbing a long, steep hill.
If it moves near the red zone, turn
of f the A/C until the gauge reads
normally.
If the interior is very warm f rom
beingparkedinthesun,youcancool
it down more rapidly by setting up
the controls this way: Turn on the A/C by pressing the
button. The light in the button
comesonwhenafanspeedis
selected.
Make sure the temperature
control dial is all the way to the left.
Select .
If the outside air is humid, select
Recirculation mode. If the outside
air is dry, select Fresh Air mode.
Set the f an to the desired speed.
Start the engine.
Turn on the A/C by pressing the
button. Make sure the tempera-
ture control dial is turned all the
way to the left.
Set the f an to maximum speed.
Open the windows partially. Select
and Fresh Air mode.
1.2. 3. 4.
1. 2. 3. 4. 5.
64
Comf ort and Convenience Feat ures
Heating and Cooling
T o Cool wit h A /C
100 AIR CONDITIONING
(A/C) BUTTON
RECIRCULATION BUTTON
MODE CONTROL
DIAL
TEMPERATURE
CONTROL DIAL FAN CONTROL DIAL

These settings direct all the air f low
to the defroster vents at the base of
the windshield and the side window
def roster vents. The air f low will get
warmer and clear the windows faster
as the engine warms up. You can
close the side vents with the dial
beside each vent. This will send
more warm air to the windshield
defroster vents.
For saf ety, make sure you have a
clear view through all the windows
bef ore driving away.You should shut the system
completely of f only f or the f irst f ew
minutes of driving in cold weather,
until the engine coolant warms up
enough to operate the heater. Keep
the fan on at all other times so stale
air does not build up in the interior.
To shut of f the system temporarily,
turn the fan speed and temperature
control dials all the way to the lef t.
Heating and Cooling
Comf ort and Convenience Feat ures
To Turn Everything Of f
103

Remove the radiator cap.
Turn the ignition ON (II). Turn
the temperature control dial to
maximum heat. Turn of f the
ignition. Open the hood. Make
sure the engine and radiator are
cool to the touch.
Thecoolingsystemshouldbe
completely drained and ref illed with
new coolant according to the time
and distance recommendations in
the maintenance schedule. Only use
Honda All Season Antif reeze/
Coolant Type 2.
Bef ore draining the coolant,
remove the cover under the
radiator.
Use a Phillips-head screwdriver to
remove the two bolts, and remove
the nine holding clips f rom the
cover (5 clips on the bottom and 4
clips on the side) with a f lat-tipped
screwdriver. Then pull the cover
away.
Draining the coolant requires access
to the underside of the vehicle.
Unless you have the tools and
knowledge, you should have this
maintenance done by a skilled
mechanic. 1.
3.
2.
CONT INUED
Replacing Engine Coolant
Cooling Syst em
Maint enance 173

If you see steam and/or spray
coming f rom under the hood, turn
of f the engine.
If you do not see steam or spray,
leave the engine running and
watch the temperature gauge. If
the high heat is due to overloading
(climbing a long, steep hill on a
hot day with the A/C running, f or
example), the engine should start
to cool down almost immediately.
If it does, wait until the tempera-
ture gauge comes down to the mid-
point then continue driving.
Saf ely pull to the side of the road.
Put the transmission in Neutral or
Park, and set the parking brake.
Turn of f the heating and cooling
system and all other accessories.
Turn on the hazard warning
indicators.
The pointer of your car’s tempera-
ture gauge should stay in the mid-
range under most conditions. It may
go higher if you are driving up a long
steep hill on a very hot day. If it
climbs to the red mark, you should
determine the reason. Your car can overheat f or several
reasons, such as lack of coolant or a
mechanical problem. The only
indication may be the temperature
gauge climbing to or above the red
mark. Or you may see steam or
spray coming f rom under the hood.
In either case, you should take
immediate action.1. 2. 3.
If Your Engine Overheats
T aking Care of t he Unexpect ed
232 Steam and spray from an
overheated engine can
seriously scald you.
Do not open the hood if steam
is coming out.
Driving with the temperature gauge
pointer at the red mark can cause
serious damage to your engine.

If the temperature gauge stays at
the red mark, turn of f the engine.
Wait until you see no more signs
of steam or spray, then open thehood.
If you don’t f ind an obvious leak,
check the coolant level in the
radiator reserve tank (see page). If the level is below the
MIN mark, add coolant to halfway
between the MIN and MAX marks. If the temperature stays normal,
check the coolant level in the
radiator reserve tank. If it has
gone down, add coolant to the
MAX mark. Put the cap back on
tightly.
If there was no coolant in the
reserve tank, you may also have to
add coolant to the radiator. Let the
engine cool down until the pointer reaches the middle of the tempera-
ture gauge, or lower, bef ore check-
ing the radiator.
Using gloves or a large heavy
cloth, turn the radiator cap
counterclockwise, without pushing
down, to the f irst stop. This
releases any remaining pressure in
the cooling system. After the
pressure releases, push down on
the cap and turn it until it comes
off.
Start the engine and set the
temperature control dial to
maximum. Add coolant to the
radiator up to the base of the f iller
neck. If you do not have the
proper coolant mixture available,
you can add plain water.
Remember to have the cooling
system drained and ref illed with
the proper mixture as soon as you
can.
Look f or any obvious coolant leaks,
such as a split radiator hose.
Everything is still extremely hot,
so use caution. If you f ind a leak, it
must be repaired bef ore you
continue driving (see
on page ). Put the radiator cap back on
tightly. Run the engine and watch
the temperature gauge. If it goes
back to the red mark, the engine
needs repair. (See
on page .)
4. 5.
6. 7. 8. 9.10.
11.
12.
133 245
245
Emergency
Towing
Emergency
Towing
If Your Engine Overheats
T aking Care of t he Unexpect ed 233
Removing the radiator cap
while the engine is hot can
cause the coolant to spray out,
seriously scalding you.
Always let the engine and
radiator cool down before
removing the radiator cap.

Bulb Replacement..........................
Back-up Lights . 206
..................................
Stop Light . 206
......................
Cargo Area Light . 211
................
Front Parking Lights . 205
........
Front Side Marker Lights . 204
.................................
Headlights . 202
.........
High-mount Brake Light . 207
...........................
Interior Lights . 210
.................
License Plate Lights . 209
..................
Side Marker Lights . 204
...........
Side Turn Signal Lights . 208
............................
Specif ications . 251
....................
Turn Signal Lights . 203
..............................
Bulbs, Halogen . 202
.........
Cables, Jump Starting With . 230
............................
Capacities Chart . 250
.............
Carbon Monoxide Hazard . 52
...........................
Cargo Area Cover . 84
.............................
Carrying Cargo . 137
Cassette Player
............................................
Care . 122
...................................
Operation . 119 ..............
CAUTION, Explanation of . ii
...................................
CD Changer . 115
.......................................
CD Player . 113
........................
Certif ication Label . 248
............................................
Chains . 199
Change Oil
........................................
How to . 169
......................................
When to . 158
....................
Changing a Flat Tire . 223
............
Changing Engine Coolant . 173
...
Charging System Indicator . 58, 235
Checking
.....................
Battery Condition . 184
................................
Brake Fluid . 178
...............................
Clutch Fluid . 178
.................................
Drive Belts . 192
..........................
Engine Coolant . 133
..................................
Engine Oil . 132
..........................................
Fuses . 241
....
Manual Transmission Fluid . 177
............
Checklist, Bef ore Driving . 142
.....................................
Child Saf ety . 20
....................
Cleaner Element, Air . 179
Cleaning
....................
Aluminum Wheels . 216
...................................
Carpeting . 216 ......................................
Exterior . 214
.........................................
Fabric . 217
.......................................
Interior . 216
...................................
Seat Belts . 218
...........................................
Vinyl . 217
....................................
Windows . 218
.........................
Clock, Setting the . 109
...................................
Clutch Fluid . 178
........................
CO in the Exhaust . 256
............
Cold Weather, Starting in . 143
..............................
Compact Spare . 222
.............
Controls, Instruments and . 55
Coolant
........................................
Adding . 171
....................................
Checking . 133
.........................
Proper Solution . 171
...................................
Replacing . 173
...................
Temperature Gauge . 64
....................
Corrosion Protection . 219
Crankcase Emissions Control
........................................
System . 256
...............................
Cruise Control . 124
Index
C
II