1999 HONDA CIVIC ect

Description
Outline
The air conditioner system removes heat from the passenger compartment by circulating refrigerant through the system
as shown below.
BLOWER FAN
EVAPORATOR(Absorption of heati
EOUALIZING TUBE(Meters pressure andimproves the expansionvalve reaction time)
into the evaporator)CAPILLATY TUBE SENSING BULB
lControls the temPerature of the
ref rigerant leaving the evaporator
by metering the expansion valve)
/\
THERMOSTAT
A/C PRESSURE SWITCH
When the refrigerant is below
200 kPa (2.0 kgtcm',28 Psi)or above 3,200 kPa 132 kgflcm',
455 psi), the Ay'C pressure
switch opens the circuit to
the A,/C switch and stops the
EXPANSION VALVE(Meters the requiredamount of refrigerant
airconditioning to Protect the
compressor.
RECEIVER/DRYER(Traps debris, andremoves morsturel
THERMAL PROTECTOR
{Opens the comPressorclutch circuit when the
compressor temPeraturebecomes too high)
RELIEF VALVE(Relieves pressure at the
compressor when thepressure is too high)
(Radiation of heat)
I
f-r--; I
(Suction and comPression,
HIGH PRESSURE VAPOR
HtGH PRESSUBE LIOUID
LOW PRESSURE LIOUID
This car uses HFC-134a (R-134a) refrigerant which does not contain chlorofluorocarbons Pay attention to the following
service items:
. Do not mix refrigerants CFC-12 (R-12) and HFC-134a (R-134a)' They are not compatible'
. Useonlythe recommended polyalkyieneglycol (PAG) refrigerant oil designedforthe R-134a compressor (SANDEN: SP-
10; DENSO: ND_OIL8). Intermixing ihe re-commended (pAG) refrigerant oil with any other refrigerant oil will result in
compressor failure.
. All A,,ic system parts {compressor, discharge line, suction line, evaporator, condenser, receiver/dryer, expansion valve'
O-rings for joints) have to be proper for refrigerant R- 134a Do not confuse with R-l2 parts'
. Use a halogen gas leak detector designed for refrigerant R-134a
. R-12 and R-134a refrigerant servacing equipment are not interchangeable. Use only a recovery/recycling/charging station
that is u,L.-listed and is certified to meet the requirements of sAE J2210 to service R-134a air conditioning systems'
. Always recover the refrigerant R-134a with an approved recovery/recycling/charging station before disconnecting any
A,/C fitting.
S]
22-5

'99 - 00 Models
UNDER DASHFUSE/BELAY BOX
No.l7 (7.54)
BLK
I
G751
$*"
O :8P coNNEcToF
n :20P CONNECToF
E 12P coNNEcroRBLK
d-
G401G402
UNDER HOOD FUSE/RELAY 8OX
N0.41 (P,0A) N0.42 (404)
COMPRESSORCLUTCHFELAY
GNITON SWTCH
HEATER CONTROL PANEL
22-7

Troubleshooting
Symptom Chart
NOTE:
. Any abnormality must be corrected before continuing the test.. Because of the precise measurements needed. use a multimeter when testinq.. Before performing any troubleshooting procedures check:- Fuses No. 47 l7 -5 Al, No. 56 (20 A) in the under-hood fuse/relay box, and No. 17 (7.5 A) in the under_dash fuse/relavbox- Grounds No. c401, c402, G751- Cleanliness and tightness of alt connectors
SymptomRemedy
Condenser fan does not run at all.Perform the procedures in the flowchart {see page 22-9).
Compressor clutch does not engage.Perform the procedures in the flowchart lsee page 22-12).
Ay'C system does not come on (compressor and fan),Perform the procedures in the flowchan (see page 22-17).
Both heater and A,/C do not work.. '96 - 98 models-Perform the procedures in the flowchart
{see page 21-18).. '99 - 00 models-Perform the procedures in the flowchart(see page 21-35).
22-8

Condenser Fan
CONDENSER FAN RELAY 4P SOCKET
JUMPERwlRE
(cont'd)
22-9
Conden3er fan does not run at all.
Check the No. 56 (20 A) fuse in the
unde.hood frJse/relaY box, and the
No. 17 (7.5 A) fuse in the under-
dash fuse/relay box.
Reolace the fuse{s), and techeck
Remove the condenser lan rclaY'
and test it (see page 22 21i
Replace the condensei fan relav.
Check the under-hood tus6/relaY
Measure the vohage between the
No. 2 terminalofthe condenser fan
relav 4P socket and bodv ground.
ls there battery voltage?
Check the condenser lan Powersupply circuit:Connect the No. 1 and No. 2 teF
minals of the condenser fan relay
4P socket with a jumper wire
Does the condenser fan run?To page 22-10
Io page 22 11

Troubleshooting
Condenser Fan (cont'd)
CONDENSER FAN RELAY 4P SOCKET
CONDENSEB FAN 2P CONNECTORWire side of female terminals
-=F_
l!.lI slx
@I
Check tor an opon in the wi.o:1. Disconnect the jumper wire.2. oisconnect the condenser tan2P connector.3. Check for continuity betweenthe No. 1 terminal of the con-denser fan relay 4P socket andthe No. 1 terminal of the con-denser fan 2P connector.
Rapair op6n in the wirs bgtwconthe condcnsor tan rclay and thecondgnlar fan.
ls there continuity?
Check to. en open in the wire:Check for continuity between theNo. 2 terminal ot the condenserfan 2P connector and bodyground.
Check Ior rn opon in th6 wirebctwoen the condcnser tan andbody ground, lf iho wirc ii OK,chcck for poor ground at G751.
ls there continuity?
Replaco the condense. fan motor.
22-10

Check the diode:1. Disconnect the iumPer wire
2. Remove the A/C diode from
the under hood fuse/relaY box
3. Check for current flow in both
directions between the A and
B terminals.
ls there current flow in onlY
one direction?
Chock for an open in the wire:
1. Turn the ignition switch ON(ll).
2. Measure the voltage between
the No. 2 terminal of the AJC
diode 2P socket and body
ground.
Repair opon in the wire betwe€n
the No. 17 luse and the A/c
diode.ls there battery voltage?
B()-=iFA
A/C DIOOE 2P SOCKET

Troubleshooting
Compressor
COMPRESSOR CLUTCH RELAY.P SOCKET
JUMPERWIRE
check the No. 56 (20 A) fuse in theunder'hood fuse/relay box, and theNo. 17 (7.5 A) fuse in the under,dash fuse/relay box.
Replace the fussls), and .echeck.
Remove the compressor clutchrelay, and test it {see page 22 21).
Check th6 und€r-hood tu3e/reby
Measure the voltage between theNo. 2 terminal of the compressorclutch relay 4P socket and bodyground.
Check the compressor clutchpow€r supply circuit:Connect the No. 1 and No. 2 termi-nals of the compressor clutch relay4P socket with a jumper wire.
Does the compressor clutch click?fo page 22-13
To page 22 14
22-12

Ftom page 22 12
Check to. an opon in tho wire:
1. Disconnect the jumper wire
2. Disconnect the comPressor
clutch 1P connector.
3. Check lor continuity between
the No. 1 terminal o{ the com_pressor clutch relaY 4P socket
and the terminal of the com-pressor clutch 1P connector'
Repeir open in the wiro between
the compressoa clutch relaY and
the comDres3or clulch.ls there continuity?
Inspect the comPre3sor clutch
clo.rance, lhe tharmal ProtgdorISANDENI, and tha compr6ssor
clutch field coil {SANDEN: Soepag. 22-33; DENSO: See Pag.22-10t.
COMPRESSOR CLUTCH RELAYiaP SOCKET
r--------t RED
L-r-]-_ll2l I--r- |l1l3l I
@
I
HI
1___J-RED
COMPRESSOR CLUTCH 1P CONNECTOR
Wire side of female terminals
(cont'd)
22-13