1998 HONDA INTEGRA Workshop Manual

Heater Unit
Replacement
SRS components are located in this area. Review the
SRS component locatio.s, precautions, and procedures
in the SRS section (23) before performing repairs or ser-
vtce.
1. When the engine is cool, drain the engine coolant
from the radiator (see section 1O).
@ oo not remove the radiator cap when
the engine is hot; the engine coolant is undol
prsssure and could sevdely scald you.
2. Ooen the clamD, then disconnect the heater valve
cable from the heater valve arm.
HEATER VALVE CABI-E
I
i
21-22
3. Disconnect the heater hoses lrom the heater unit.
CAUTION: Engine coolant will damaga paint. Ouick-
ly rinse any spilled engine coolant from painted
sudaces.
NOTE: Engine coolant will run out when the hoses
are disconnected, drain it into a clean drip pan.
4. Remove the mounting nut from the heater unit.
NOTE: When removing the mounting nut, take care
not to damage or bend the fuel pipes, brake pipes,
etc.
8 x 1.25 mm22 N'llt. 12.2 kgl'm, 16 lbl.tl)
CLAMPS
HEATER HOSES

.J
5.
6.
7.
8.
Remove the dashboard (see section 2O).
Remove the heater duct (see page 21 20) or the
evaporator lsee page 22-261.
Remove the two bolts, the nut and the passenger's
SRS beam.
PASSENGER'SSRS BEAM
Disconnect the mode control motor connector. and
remove the wire harness clip from the heater unit.
Remove the two mounting nuts and the heater unit.
6 x 1.0 mm9.8 N.m (1.0 kgf.m, 7.2 lbf.ftl
I r 1.25 mm22 N.m 12.2 kgf.m, 16 lbf'ft)
Il
I
I
lnstall in the reverse order of removal. Make note of
these items:
. Apply sealant to the grommets
. Do not interchange the inlet and outlet hoses.
Make sure that the hose clamps are secure.
. Loosen the bleed bolt on the engine and refill the
radiator and coolant reservoir with the proper
engine coolant minure (see section 10).
Tighten the bleed bolt when all the trapped air
has escaped and engine coolant begins to flow
from it (see section 10).
. Connect all cables and make sure they are prop-
erly adjusted (see page 2'l-271.
;!
i
21-23

1.
2.
Remove the screw and the damper arm cover.
Disconnect the link from the damper arm, and re-
move the screw and the damper arm.
Remove the two screws and the heater core cover.
Remove the screw and the pipe clamp.
Pull out the heater core.
NOTE: Be careful not to bend the inlet and outlet
pipes during heater core removal.
Assemble in the reve.se order of disassembly.6.
HEATER CORE COVER
OAMPER ARM COVER
HEATEF CORE
DAMPER ARM
'r/ rll
I)Y
Heater Unit
Overhaul
\
21-24

Heater Control Panel
Replacement
J
2.
1.Disconnect the air mix control cable from the heat
er unit (see page 21-27).
Remove the rear window delogger switch and the
hazard warning switch.
Remove the two self-tapping screws, then pull out
the heater control panel and the center air vent. Dis-
connect the connectors, and remove the heater con-
trol panel and the center air vent.
NOTE: The locking tabs of the hazard warning
switch and heater control panel connectors are on
the bottom.
CENTER AIR VENTREAR WINDOWD€FOGGERswtrcH
HAZARDWARNINGswrTcH
CONNECTORS
4. Remove the four self-tapping screws and the center
atr vent.
Install in the reverse order of removal, and adjust the
air mix control cable at the heater unit (see page
21-271.lt necessary, adjust the heater valve cable
lsee page 21-27).
5.
AIR MIX CONTROL CABLE
CENTER AIR VENT
21-25

HEATER FAN SWITCHTest, page 21 30
AIR MIX CONTROL CABLEAdjustment, page 21-27
Air Mix Contlol Cable ReDlacement
1. Cut the inner cable on the lever side of the cable
holder, then remove both pieces of the inner cable.
2.Using a shafp knife, cut completely through the end
of the cable housing at the two locations.
Slide the large section of the cable housing out of
the cable holder, being careful not to damage the
cable stops.
Carefully remove the cut pieces of the cable hous
ing with a small tlat tip screwdriver.
Hook the tip of the new air mix cable to the temper-
ature control lever, then push the cable housing into
the cable holder until it locks place.
3.
AIR MIXCONTROLCABLE
5.
NOTEr Atter assembly, check that the temperature control lever slides smoothly through the full stroke from right
to left.
Heater Control Panel
Overhaul
t
21-26

Heater Valve Cable
Adjustment
Air Mix Control Cable
Adjustment
lnri
I
I
I
I
l.Disconnect the heater valve cable from the heater
valve arm and the clamp, and from the heater con-
trol arm and the clamp.
Set the temperature control lever to MAX. HEAT.
Turn the heater control arm, as shown, then connect
the end of the heater valve cable to the heater con-
trol arm.
Gently slide the heater valve cable housing back from
the end enough to take up any slack in the heater
valve cable, but not enough to make the tempera-
ture control lever move. Hold the end of the heater
valve cable housing against the stop, then snap the
heater valve cable housing into the clamp.
HEATER CONTROLARM
HEATERVALVEARM
HEATER VALVECABLECLAMP
5. Turn th€ heater valve arm as shown, and connect
the end of the heater valve cable to the heater valve
arm.
STOP
6. Gently slide the heater valve cable housing back from
the end enough to take up any slack in the heater
valve cable, but not enough to make the tempera-
ture control lever move. then snap the heater valve
cable housing into the clamp.
NOTE: The air mix control cable should alwavs be
adjusted whenever the heater valve cable has been
disconnected.
HEATER VALVE CABLE
,i$.
CLAMP
1.Disconnect the air mix control cable from the air mix
control arm and the clamp.
Set the temperature control lever to MAX. HEAT.
Turn the air mix controlarm, as shown, then connect
the end of the air mix control cable to the air mix
control arm.
Gently slide the air mix control cable housing back
from the end enough to take up any slack in the air
mix control cable, but not enough to make the tem-
perature control lever move, then snap the air mix
control cable housing into the clamp.
NOTE: The heater valve cable should always be ad-
justed whenever the air mix control cable has been
disconnected.
2.
3.
AIR MIX CONTROLCABLEAIR MIX CONTROLARM
21-27

Mode Control Motor
Test
Connect battery power to the No. 4 terminal of themode control motor and connect ground to the No.
I terminal.
Using a jumper wire, connect the No. 8 termjnal in-dividually to the No. 1, 2, 3, 6 and 7 terminals, inthat order. Each time the short circuit is made. themode control motor should run smoothly and stop.
NOTE: lf the mode control motor does not run whenshorting the first terminal, short that te.minal againafter shorting the other terminals.
The mode control motor is OK if it runs when jumping
the tirst terminal again.
lf the mode control motor does nol run in steD 2, re-move it, and check the mode control linkage anddoors for smooth movement. lf the mode controllinkage and doors move smoothly, replace the mode
control motor.
Replacement
MODE CONTROLMOTOR
Disconnect the mode control motor 8P connector,
and remove it lrom the heater unit,
Remove the lwo sc.ews, the mode control motor,
and the flange collar.
MODE CONTROLMOTOR 8PCONNECTOR
Install in the reverse order of removal. After instal-lation, make sure the mode control motor runssmoothly.
21-28

lli
''
ltRecirculation Control Motor
Test
1.Connect battery power to the No. 1 terminal of the
recirculation control motor, and connect ground to
the No. 2 and No. 4 terminals; the recirculation con-
trol motor should run smoothly.
Disconnect the No. 2 or No. 4 terminal from ground;
the recirculation control motor should stop at FRESH
or RECIRCULATE.
CAUTION: Never connect the battery in the oppo-
site dilection.
NOTE: Don't cycle the recirculation control motor
for a long time.
lf the recirculation control motor does not run in step
1, remove it, and check the recirculation control link-
age and door lor smooth movement. If the recircu-
lation control linkage and door move smoothly,
reDlace the recirculation control motor.
3.
1.Disconnect the 4P connector from the recirculation
control motor, and remove the wire harness clip from
it.
2. Remove the two screws, the recirculation
motor and the flange collaf.
scREwsRECIRCULATIONCONTROL MOTOB
lnstall in the revefse order of removal. After instal-
lation, make sure the recirculation control motor runs
smoothly.
4P CONNECTOR
Replacement
21-29