2003 HONDA CIVIC heating system

Heating and Air Conditioning
Gondenser Replacement
1.
6x1.0mm9.8 N.m ('1.0 kgf.m,7.2lbf.ft)
Recover the refrigerant with a recovery/recycling/
charging station (see page 21-53).
Remove the front bumper {see page 20-85).
Remove the bolts, then disconnect the discharge
line (A) and the condenser line (B) from the
condenser. Plug or cap the lines immediately after
disconnecting them to avoid moisture and dust
conlamtnaflon.
,t\
6x1.0mm9.8 N.m (1.0 kgt.m.7.2lbf.ft)
21-52
4, Remove the mounting bolts, then remove the
condenser by lifting it up. Be careful not to damage
the radiator or the condenser fins when removino
the condenser.
6 x '1.0 mm9.8 N.m ('1.0 kgf.m,7.2 tbl.ftl
5.lnstallthe condenser in the reverse order of
removal, and note these items.
. lf you're installing a newcondenser, add
refrigerant oil (KElHlN SP- 10) lsee page 21'6).. Replace the O-rings with new ones at each fitting,
and apply a thin coat of refrigerant oil before
installing them. Be sure to use the correct O-rings
for HFC-134a (R-'134a)to avoid leakage.. lmmediately after using the oil, reinstallthe cap
on the container, and seal it to avoid moisture
absorption.. Do not spillthe refrigerant oil onthevehicle;it
may damage the paint. lf the refrigerant oil
contacts the paint, wash it off immediately.. Be careful not to damage the radiator or the
condenser fins when installing the condenser.. Charge the system (see page 21-55).
t -"'.
f,
t-
-li .:)-:.-- ---- - -'

Heating and Air Conditioning
System Evacuation
Use only service equipment that is U.L.-listed and is
certified to meet the requirements of SAE J2210 to
remove HFC-134a (R-134a)from the air conditioninq
system.
lf accidental system discharge occurs, ventilate the
work area before resuming service.
Additional health and safety information may be
obtained from the refrigerant and lubricant
manufacturers.
1. When an Ay'C system has been opened to the
atmosphere, such as during installation or repair, it
must be evacuated using a R-134a refrigerant
recovery/recycling/charging station (lf the system
has been open for several days, the receiver/dryer
should be replaced, and the system should be
evacuated for several hours.)
. Air conditioning refrigerant or lubricant vapor
can irritate your eyes, nose, or throat.. Be carefulwhen connecting service equipment.. Do not breathe refrigerant or vapor.
21-54
2. Connect a R-134a refrigerant recovery/recycling/
charging station (A)to the high-pressure servicepon (B) and the low-pressure service port (C), as
shown, following the equipment manufacturer's
instructions. Evacuate the system.
lf the low-pressure does not reach more than 93.3
kPa {700 mmHg, 27.6 in.Hg) in 15 minutes, there isprobably a leak in the system. Partially charge the
system, and check for leaks (see step 3 on page 21-
56).
-i - r4.t

Heating and Air Conditioning
Refrigerant Leak Test
Special Tool Required
Leak detector, Honda Tool and Equipment YGK-H-10PM
commerciallv available
Compressed air mixed with R-134a forms a
combustible vapor.
The vapor can burn or explode causing serious
injury.
Never use compressed air to pressure test
R-134a service equipment or vehicle air
conditioning system.
Air conditioning refrigerant or lubricant vapor
can irritate your eyes, nose, or throat.
Be carefulwhen connecting service equipment.
Do not breathe refrigerant or vapor
Use only service equipment that is U.L.-listed and is
certiified to meet the requirements of SAE J2210 to
remove HFC-134a (R-134a) from the air conditioning
system.
lf accidental system discharge occurs, ventilate the
work area before resuming service.
R-134a service equipment or vehicle air conditioning
systems should not be pressure tested or leak tested
with compressed air.
Additional health and safety information may be
obtained from the refrigerant and lubricant
manufacturers.
21-56
1. Connect a R-134a refrigerant recovery/recycling/
charging station (A) to the high-pressure serviceport (B) and the low-pressure service port (C), as
shown, following the equipment manufacturer's
anstructions.
Open the high pressure valve to charge the system
to the specified capacity, then close the supply
valve, and remove the charging system couplers.
Select the appropriate units of measure for your
refrigerant charging station.
Refrigerant capacity:
500 to 550 g
0.50 to 0.55 kg
1.10 to 1.21 lbs
17.6 to 19.4 oz
Check the system for leaks using a R-134a
refrigerant leak detector with an accuracy of 14 g(0.5 oz) per year or better.
lf you find leaks that require the system to be
opened (to repair or replace hoses, fittings, etc.),
recover the system.
After checking and repairing leaks, evacuate the
system.
3.

Heating and Air Conditioning
A/C System Tests (cont'd)
1.
Performance Test
Air conditioning refrigerant or lubricant vapor
can irritate your eyes, nose, or throar.
Be carefulwhen connecting service equipment.
Do not breathe refrigerant or vapor.
The performance test will help determine if the air
conditioner system is operating within specifications.
Use only service equipment that is U.L.-listed and is
cenified to meet the requirements of SAE J2210 toremove HFC-134a (R-134alfrom the air conditioning
system.
lf accidental system discharge occurs, ventilate the
work area before resuming service
R-134a service equipment or vehicle air conditioning
systems should not be pressure tested or leak testedwith compressed air.
Additional health and safety information may be
obtained from the refrigerant and lubricant
manufacturers.
Connect a R-134a refrigerant recover/recycling/
charging station to the high-pressure service port
and the low-pressure service port, following the
equipment manufacturer's instructions.
Determine the relative humidity and air
Iemperaru re.
' Compressed air mixed with R-134a forms a
combustible vapor.. The vapor can burn or explode causing serious
Injury.. Never use compressed air to pressure test
R-134a service equipment or vehicle air
conditioning systems.
21-58
4.
Open the glove box. Remove both glove box stops,
then let the glove box hang down (see page 20-63).
Insert a thermometer (A) in the center vent, andplace another thermometer {B) near the blower unit.
Test conditions:
. Avoid direct sunlight.. Open the hood.. Open the front doors.. Sel the temperature control dial on Max Cool, the
mode control dial on Vent, and the recirculation
control switch on Recirculate.. Turn the A,/C switch on and the fan switch on Max.. Run the engine at 750 rpm.. No driver or passengers in vehicle.
After running the air conditioning for I0 minutes
under the above test conditjons, read the delivery
temperature from the thermometer in the center
vent, the intake temperature near the blower unit,
and the high and low system pressure from the Ay'Cga uges.

Service Manual lndex
)s
NOTE: Referto the lollowing listto look up A/C Pressure Switch CircuitDTCS, symptoms, fuses, connectors, wire Troubleshooting ......... ...-.-....-...-.-.-....-..21-32 Bharnesses, specifications, maintenanceschedules, and general serviceinlormation:
DTC Troubleshooting Indexes
A/C Signal CircuitTroubleshooting.........................-...... 11-'133 Back-up Light SwitchTest .......................................................... 13'3A/F lAir Fuel Ratiol SensorABS/TCS Components ........................ 19-34 Replacement ....................................... 1 1-113 Back-up Li9ht3EPS Components ................................. '17-22 Circuit DiagramFueland Emissions11-i A-Dillar Corner Trim
ABS Indicator Circuit
Heating/Ventilation ................................ 21-9 Replacement ...............-.....-..............-.... 20,96 Ball Joint BootssRS ........................................................ 23-28Replacement ......
... 19-52 Ball Joints
22-75
18 16
Remova1.............-.......... . ...........18-10Symptom Troubleshooting Indexes TroubleshootingABS/TCSComponents........................ 19 35Cruise Control System ..........................4 38 ABS Modulator-contml UnitEPS Components ................................. 17-23 Bemoval/lnstallation ............................ 19-57 BettervFan Controls10,12
Accessory Powor Socket Front
Blowor Pow€r Transistor
.......22 50
Blower UnitRemoval/lnstallation ............................ 21-39
Fuel and Em issions .............................. 11-10 ABS/TCS ComoonentsHeating/Ventilation..............................21 10 Component Location Index ................. 19-30 Beverage Holder
SRS ........................................................ 23'30 CircuitDiaqram.......................... 19'42Blower MotorReplacement .....21 41
21-38
Power 0istribution ...............................22-46 TesVReplacement .............................. 22'149Under-dash Fuse/Relay Box ............... 22 45Under-hood Fuse/Belay Box ...............22 44 Accessory Power Sockets
Fuse/Relay lndexes
(to harness)
Connector and Wire Harness lndexesComponent Connectors
Circuit Oiagram .................................. 22-149
Air Cleaner......2214 Rep1acemen1.....................................11-162
Air MixControl MotorMeintenence section .................... Section 3 Replacement ......................................... 21'34 Brake CelipersTest......................21-34 Overhaul19-14,23Gene.al lnlormation section........ Section 1
21.57
Airbag. Driver's
Ahernator FR Signal CircuitTroubleshooting .... .........-..........11 134
AntennaReplacement
Inspection ............................................. 19-24Rep|acement................. .................... 19-25
Bieke Meder Cylinder
Irake Discs
A
Replacement ....................................... 23 1 'l3 Inspection .................... ................... 19-13,22Repair ...........-...................................... 23 1 16Brake Fluid Level SwitchAirbag. Front Passenger's TestBeplacement....................................... 23-1 14AIC Brake LightsComponent Location fndex ...................21-3 Altemator CircuitDiagram....................................22-74Description.....................................-....21'1'l Beplacement ................ ........................... 4 29CircuitDiagram....................................21-14 Overhaul .................................................4-30 Brake Lines and Hoses
19.10
A/C CompressolReplacement .......-...-............................. 21 -41
A/C Compr€ssor ClulchRep1acement......................................... 19-15.........22-103 Inspection ............................................. 19-16Inspecton........Overhaul ..........
A/C CondenserReplacement,.,
21-442l-49 Audio Unit
Replacement
Brake PadsRemoval/lnstallation .. ........................22-100 Inspection/Rep1acement................ 19-11,20A/C Compressor Clutch CircuitTroubleshooting ................................... 21-30 Audio Unit Connector Brake Pedal22101 Adjustment..............19,6ArfC Comoressor Relief ValvcReplacement ..........-...-.......................... 21-51 Audio/Entertainment
A/C Compr$sor Thermal Protector Circuit DiagramReplacement............-............................ 21-51
Component Location In dex .................22-9A Test .......-.............. 22-84Breke Pedal Posilion Switch
Brake Pedal Position Switch Signal Clrcuit11-137
.....21 52
A/C Condenser Fan CircuitTroubleshooting ................... . . . . . .....21-28
)s
Troubleshooting
(cont'd)