2003 HONDA CIVIC HATCHBACK COOLING ENGINE

If the coolant level in the reserve
tank is at or below the MIN line, add
coolant to bring it up to the MAX line.
Inspect the cooling system f or leaks.
The coolant you add should always
be a mixture of 50 percent antif reeze
and 50 percent water. Never add
straight antif reeze or plain water.If the reserve tank is completely
empty, you should also check the
coolant level in the radiator.
Always use Honda All Season
Antif reeze/Coolant Type 2. This
coolant is pre-mixed with 50 percent
antif reeze and 50 percent water. It
does not require any additional
mixing.
If it is not available, you may use
another major-brand non-silicate
coolant as a temporary replacement.
Make sure it is a high-quality coolant
recommended f or aluminum engines.
However, continued use of any non-
Honda coolant can result in
corrosion, causing the cooling
system to malf unction or f ail. Have
the cooling system f lushed and
ref illed with Honda antif reeze/
coolant as soon as possible.
CONT INUED
A dding Engine Coolant
Cooling Syst em
Maint enance
171
RESERVE TANK
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.

Remove the radiator cap by
pushing down and turning
counterclockwise.
Turn the radiator cap counter-
clockwise, without pressing down
on it, until it stops. This relieves
any pressure remaining in the
cooling system.
Make sure the engine and radiator
are cool.
The coolant level should be up to
the base of the f iller neck. Add
coolant if it is low.Do not add any rust inhibitors or
other additives to your car’s cooling
system. They may not be compatible
with the coolant or engine compo-
nents.
Pour coolant into the reserve tank.
Fill it to half way between the MAX
and MIN marks. Put the cap back
on the reserve tank.
Pourthecoolantslowlyand
caref ully so you do not spill. Clean
up any spills immediately. Spilled
coolant could damage components
in the engine compartment.
Put the radiator cap back on.
Tighten it f ully.
2. 3. 4. 5.6.
1. Maint enance
Cooling Syst em
172RADIATOR CAP
RESERVE TANK

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 necessary, f ill the reserve tank
to the MAX mark. Install the
reserve tank cap.
Install the radiator cap, and
tighten it fully.
Start the engine and hold it at
1,500 rpm until the radiator f an
comes on. Turn of f the engine.
Check the coolant level in the
radiator and add coolant if needed.
Remove the radiator cap. Fill the
radiator with coolant up to the
base of the f iller neck.
Start the engine and let it run until
the radiator fan comes on two
times. Then stop the engine.
Pour Honda All Season
Antif reeze/Coolant Type 2 into
the radiator up to the base of the
f iller neck. This coolant is a
mixture of 50 percent antif reeze
and 50 percent water. Pre-mixing
is not required.
The cooling system capacity is: Install the radiator cap, and
tighten it to the first stop.
Fill the reserve tank to the MAX
mark. Install the reserve tank cap.
Check the level in the radiator,
add coolant if needed.
Start the engine and let it run f or
about 30 seconds. Then turn of f
the engine.
10. 19.
18.
17.
16.
15.
11. 12. 13.14.
Cooling Syst em
Maint enance 175
RESERVE TANK
Fill up to here
1.32 US gal (5.0
)

Periodically check the engine’s
radiator and air conditioning
condenser f or leaves, insects, and
dirt stuck to the f ront surf ace. These
block the air f low and reduce cooling
ef f iciency. Use a light spray f rom a
hose or a sof t brush to remove them.If the air conditioning does not get as
cold as before, have your dealer
check the system. Recharge the
system with Ref rigerant HFC-134a
(R-134a). (See Specif ications on page
.)
Run the air conditioning at least once
a week during the cold weather
months. Run it f or at least ten
minutes while you are driving at a
steady speed with the engine at
normal operating temperature. This
circulates the lubricating oil con-
tained in the ref rigerant.
Your car’s air conditioning is a sealed
system. Any major maintenance,
such as recharging, should be done
by a qualif ied mechanic. You can do
a couple of things to make sure the
air conditioning works ef f iciently.
251
A ir Condit ioning Syst em
Maint enance189
AIR CONDITIONING
CONDENSER
Whenever you have the air conditioning
system serviced, make sure the service
f acility uses a ref rigerant recycling
system. This system captures the
ref rigerant f or reuse. Releasing
ref rigerant into the atmosphere can
damage the environment.
The condenser and radiator f ins bend
easily. Only use a low-pressure spray
or sof t-bristle brush to clean them.

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.

...
Identif ication Number, Vehicle . 248
......
If Your Car Has to be Towed . 245
Ignition
..............................................
Keys . 72
...........................................
Switch . 72
5-speed Manual Transmission
...............
Checking Fluid Level . 177
................................
Shif ting the . 144
.............
Flashers, Hazard Warning . 70
...................
Flat Tire, Changing a . 223
Fluids
..........................................
Brake . 177
.........................................
Clutch . 177
..............
Manual Transmission . 177
..................
Windshield Washer . 176
FM Stereo Radio ...................................
Reception . 111
...........................
Folding Rear Seat . 83
.....
Foreign Countries, Driving in . 255
..........................
Four-way Flashers . 70
Front End, Towing by
................
Emergency Wrecker . 245
.................................................
Fuel . 128
......................
Fill Door and Cap . 129
...........................................
Gauge . 63
................
Octane Requirement . 128
...............................
Oxygenated . 254
........................
Reserve Indicator . 60
........................
Tank, Filling the . 129
.....................
Fuses, Checking the . 241 ...............
Gas Mileage, Improving . 134
..........................................
Gasohol . 254
.........................................
Gasoline . 128
...............
Fuel Reserve Indicator . 60
...........................................
Gauge . 63
................
Octane Requirement . 128
........................
Tank, Filling the . 129
................
Gas Station Procedures . 129
Gauges
Engine Coolant
...........................
Temperature . 64
...............................................
Fuel . 63
Gearshif t Lever Positions 5-speed Manual
.........................
Transmission . 144
..............................
Glass Cleaning . 218
........................................
Glove Box . 90
.............
Halogen Headlight Bulbs . 202
Hatch
.................................
Opening the . 80
..............
Hazard Warning Flashers . 70 Headlights
............
Daytime Running Lights . 67
..................
High Beam Indicator . 59
...........
High Beams, Turning on . 66
............
Low Beams, Turning on . 66
........................
Reminder Beeper . 66
........
Replacing Halogen Bulbs . 202
...................................
Turning on . 66
..............................
Head Restraints . 82
.......................
Heating and Cooling . 96
.............
High Altitude, Starting at . 143
.................
High-Low Beam Switch . 66
....................................
Hood Latch . 181
.......................
Hood, Opening the . 130
..............................................
Horn .3,65
.......
Hot Coolant, Warning about . 171
...........................
Hydraulic Clutch . 178
.................................
Hydroplaning . 152
Index
G H I
IV