1999 HONDA CIVIC Power

Mode Control Motor
2.
Test
1.
4.
Disconnect the 7P connector from the mode control
motor.
Connect battery power to the No, 1 terminal, and
ground the No.7 terminal,
CAUTION: Never connecl the battery in iho oppo-
site direction.
Using a jumper wire, connect the No. 7 terminal
individually to the No. 2,3, 4,5 and 6 terminals in
that order. Each time the connection is made, the
mode control motor should run smoothly and stop.
NOTE: lf the mode control motor does not run when
jumping the first terminal, jump that terminal again
after jumping the other terminals. The mode control
motor is OK if it runs when jumping the first termi-
nal again.
MODE CONTROL MOTOR
lf the mode control motor does not run in step 3,
remove it. then check the mode control linkage and
doors for smooth movement. lf they move smoothly,
reolace the mode control motor,
Replacement
1. Disconnect the 7P connector from the mode control
motor,
Remove the rod from the arm of the mode control
motor.
Remove the tyvo self-tapping screws and the mode
control motor.
lnstall in the reverse order of removal. After installa'
tion, make sure the mode control motor runs
smoothly.
7P CONNECTOR
21-47

Recirculation Control Motor
Test
LDisconnect the 4P connector from the recirculation
control motor.
Connect battery power to the No. I terminal, andground the No.2 and No. 4 terminals; the recircula-
tion control motor should run smoothly.
CAUTION: Never connest ths battery in the oppo-
site direction.
Disconnect the No. 2 or No. 4 terminals from ground;
the recirculation control motor should stop at FRESH
or RECIRCULATE.
NOTE: Don't cycle the recirculation control motor
for a long time.
RECIRCULATION CONTROL MOTOR
4. lf the recirculation control motor does not run in step
2, remove it, then check the recirculation control link-
age and door for smooth movement. lf they move
smoothly, replace the recirculation control motor.
21-48
Replacement
L Disconnect the 4P connector from the recirculation
control motor, and remove the wire harness clip
from it.
Remove the two self-tapping screws and the recir-
culation control motor.
Install in the reverse order of removal. After installa,
tion, make sure the recirculation control motor runs
smoothly.
4P CONNECTOR
CONTROL MOTOR

RelaysHeater Fan Switch
Test
There should be continuity between the No 1 and No. 3
terminals when power and ground are connected to the
No.2 and No. 4 terminals, and there should be no conta-
nuity when power is disconnected.
Blower motor relaY
. Blower motor high relay ('99 00 models)
,I It;€'Y )
Test -'96 - 98 Models
Check for continuity between the terminals according to
the table below.
lerminal
Position14253
OFF
1IrJ
2o-o
3o-a
4c)-{
21-49

Mode Control SwitchPower Transistor
Test -'96 - 98 Models
Check for continuity between the terminals accordinq tothe table below.
Terminal
Position't071
Heato-o
HeaVDefo---o
Defo--o
VentG-o
HeaVVento--o
1
;l t
4
789
21-50
Test -'99 - 00 Models
1. Disconnsct the 3P connector from the oower tran-stsror.
2, Carefully release the lock tab on the No. 2 terminal inthe 3P connector, then remove the terminal and insu-late it from body glound.
Connect a 1.2 - 3.4 W bulb between the No. 1 andthe No. 2 cavity on the 3P connector.
Reconnect the 3P connector to the power translstor.
Turn the ignition switch ON fll), and check that theblower motor runs.
12V 1.2-3,1W
No. 1 laLU/aLK)

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

A/C ThermostatRelays
Test
1.Remove the Ay'C thermostat (see page 22-29).
Connect baftery power to the No. 3 terminal, ground
the No. 2 terminal, and connect a test light between
the No. 1 and No. 3 terminals.
NOTEr Use a 12 V,3 W- l8 W test light.
Dip the IVC thermostat into a cup filled with ice water,
and check the test light.
Serp6ntine-type evaporator
The light should go off at 36 - 39'F {2 - 4"C} or less, and
should come on at 39 - 41"F (4 - 5"C) or more
Laminale-type evaporator
The light should go off at 39 - 43'F (4 - 6'C) or less, and
should come on at 43 - 45"F (6 - 7'C) or more
lf the light doesn't come on and go off as specified,
replace the PVC thermostat.
12V,3W-18W
Test
There should be continuity between the No, 1 and No.2
terminals when power and ground are connected to the
No.3 and No. 4 terminals, and there should be no conti-
nuitv when Dower is disconnected.
2
Condenser fan relay
Compressor clutch relay
a
a
,I Ib
In Io'r I
t\----,'
t:n
,,l[4..-.
22-21

Compressor (SANDENI
Replacement
1.lf the compressor is marginally operable, run the
engine at idle speed, and let the air conditioner
work for a few minutes. then shut the engine off.
Disconnect the negative cable from the battery.
Recover the refrigerant with a recovery/recycling/
charging station (see page 22-27l..
Remove the bolts, then disconnect the suction and
discharge lines from the compressor.
NOTE: Plug or cap the lines immediately after dis-
connecting them to avoid moisture and dust con-
tamination.
6xl.0mm
Remove the condenser (see page 22-44).
NOTE: Do not disconnect the discharge hose from
the condenser.
Remove the power steering pump belt (see section
17 t.
22-30
24 N.m l2.ia kgt.m, 17 lbf.ftl
7. Loosen the center nut of the idler pulley and the
adjusting bolt. then remove the A,/C compressor belt
from the pulleys. Remove the two mounting bolts
from the left front mount, then remove the ly'C com-pressor belt by passing it through the gap befiiveen
the bodv and the left front mount.
ADJUSTING BOLT
1.0 x 1.25 mmaa N.m 14.5 kgf,m, 33 bnft)
8. Remove the four mounting bolts and the compressor.
CENTER NUT
COMPRESSOR

9. lf necessary, remove the compressor bracket as fol-
lows.
. Remove the nut and the washer.
NOTE: When tightening the nut of the left front
mount, make sure the washer is set properly on
the left front engine mount as shown.
. Remove the four mounting bolts and the com-
pressor bracket.
12 x 1.25 rrirn59 N.m 16.0 kgt'm,43 tbf.ft)
COMPRESSORBRACKET
WASHER
1.0 x 1.25 mm44 N.m (i1.5 kg{.m, 33 lbl.ft)
LEFT FRONTMOUNT
10. lnstall in the reverse order of removal. Make note of
the following items.
. lf you're installing a new compressor, drain all
the refrigerant oil from the removed compressor,
and measure its volume. Subtract the volume of
drained oil from '130m? 14 1/3 tl'o2,4 6 lmp'oz);
the result is the amount of oil you should drain
from the new compressor (through the suction
fifting).
. Replace the O-rings with new ones at each fit-
ting, and apply a thin coat of refrigerant oil
before installing them
NOTE: Be sure to use the right O-rings for HFC-
134a (R-134a) to avoid leakage
. Use refrigerant oil (SP-10) for R-134a Sanden and
Hadsys spiral type compressors only'
o To avoid contamination, do not return the oil to
the container once dispensed, and never mix it
with other refrigerant oils.
. lmmediatelY after using the oil, replace the cap
on the container, and seal it to avoid moisture
absorption.
. Do not spill the refrigerant oil on the vehicle; it
may damage the painu if the refrigerant oil con-
tacts the paint, wash it off immediately
. Adjust the Ay'C compressor belt (see page 22-43)
and the power steering pump belt (see section 17)'
. Charge the system (see page 22-46), and test its
oerformance (see Page 22-241
22-31