ACURA TL 1995 Service Repair Manual

Recirculation Contro l Moto r
Replacemen t
1. Remov e th e wir e harnes s clips , th e thre e self-tap -
pin g screw s an d th e pip e cover .
PIPE COVE RWIRE HARNES S CLIP S
2. Disconnec t th e 4 P connecto r fro m th e recirculatio n
contro l motor .
3 . Remov e th e thre e self-tappin g screws , th e recircula -
tio n contro l moto r an d th e flang e collar .
RECIRCULATIO NCONTROL MOTO R
FLANGE COLLA R
4. Instal l i n th e revers e orde r o f removal . Afte r installa -
tion , mak e sur e th e recirculatio n contro l moto r run s
smoothly .
Test
1. Disconnec t th e 4 P connecto r fro m th e recirculatio n
contro l motor .
2 . Connec t batter y powe r t o th e No . 1 terminal , an d
ground the No . 2 an d No . 4 terminals ; th e recircula -
tio n contro l moto r shoul d ru n smoothly .
CAUTION : Neve r connec t th e batter y in th e oppo -
sit e direction .
3 . Disconnec t th e No . 2 or No . 4 terminal s fro m ground ;
th e recirculatio n contro l moto r shoul d sto p a t FRES H
or RECIRCULATE .
NOTE: Don' t cycl e th e recirculatio n contro l moto r
for a lon g time .
RECIRCULATIO NCONTROL MOTO R
4.If th e recirculatio n contro l moto r doe s no t ru n i n
ste p 1 , remov e it , the n chec k th e recirculatio n con -
tro l linkag e an d door s fo r smoot h movement . I f the y
mov e smoothly , replac e th e recirculatio n contro l
motor.
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In-car Temperatur e Senso r
Replacemen t
1. Remove the dashboard center panel (see page
22-49).
2 . Remov e th e in-ca r temperatur e senso r fro m th e
dashboard , the n disconnec t th e 2 P connecto r an d
th e ai r hose .
AIR HOS E
IN-CA R TEMPERATUR E SENSO R
3. Instal l i n th e revers e orde r o f removal .
NOTE : B e sur e to connec t th e ai r hos e securely .
Test
Compar e th e resistanc e readin g betwee n th e No . 1 an d
No . 2 terminal s o f th e in-ca r temperatur e senso r wit h
th e specification s show n i n followin g graph ; resistanc e
shoul d b e withi n specifications .
NOTE : Chec k fo r chang e i n resistanc e b y heatin g o r
coolin g th e senso r wit h a hai r drier , etc .
CAUTION : Th e senso r use s a thermisto r whic h ca n b e
damage d i f hig h curren t i s applie d durin g testing .
Therefore , us e a circui t teste r wit h a n outpu t o f 1 m A o r
les s a t th e 2 0 k range .
IN-CAR TEMPERATUR E SENSO R
TEMPERATUR E
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Outside Ai r Temperatur e Senso r
Replacemen t
1. Disconnec t th e 2 P connecto r fro m th e outsid e ai r
temperatur e sensor .
2 . Releas e th e lock , an d remov e th e outsid e ai r tem -
peratur e sensor .
OUTSID E AI R TEMPERATUR E SENSO R
LOCK
3. Instal l i n th e revers e orde r o f removal .
Test
Compar e th e resistanc e readin g betwee n th e No . 1 an d
No . 2 terminal s o f th e outsid e ai r temperatur e senso r wit h
th e specification s show n i n followin g graph ; resistanc e
shoul d b e withi n specifications .
NOTE : Di p th e senso r i n ic e water , an d measur e resis -
tance . The n pou r ho t wate r o n th e sensor , an d chec k fo r
chang e in resistance .
CAUTION : Th e senso r use s a thermisto r whic h ca n b e
damage d i f hig h curren t i s applie d durin g testing .
Therefore , us e a circui t teste r wit h a n outpu t o f 1 m A o r
les s a t th e 2 0 k range .
OUTSIDE AI R TEMPERATUR E SENSO R
TEMPERATUR E
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Sunlight Sensor

Replacement

1. Remove the sunlight sensor from the left tweeter

speaker grille, and disconnect the 2P connector.

NOTE: Be careful not to damage the left tweeter

speaker grille.

SUNLIGHT SENSOR

2. Install in the reverse order of removal.
Test

Turn the ignition switch ON (II). Measure the voltage

between the terminals with the (+) probe on the No. 1

terminal and the (-) probe on the No. 2 terminal with the

2P connector connected. Voltage should be;

3.7 ± 0.2 V or more with the sensor out of direct sun-

light.

3.6 ± 0.2 V or less with the sensor in direct sunlight.

NOTE: The voltage will not change under the light of a

flashlight or a fluorescent lamp.

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Evaporator Temperatur e
Sensor Powe r Transisto r
TestTes t
Compar e th e resistanc e readin g betwee n th e No . 1 an d
No . 2 terminal s o f th e evaporato r temperatur e senso r
wit h th e specification s show n i n followin g graph ; resis -
tanc e shoul d b e withi n specifications .
1 . Di p th e senso r i n ic e water , an d measur e resistance .
2 . Pou r ho t wate r o n th e sensor , an d chec k fo r chang e
i n resistance .
CAUTION : Th e senso r use s a thermisto r whic h ca n b e
damage d i f hig h curren t i s applie d durin g testing .
Therefore , us e a circui t teste r wit h a n outpu t o f 1 m A o r
les s a t th e 2 0 k range .
EVAPORATO R TEMPERATUR E SENSO R
TERMINA L SID E O F MAL E TERMINAL S
1. Disconnec t th e 3 P connecto r fro m th e powe r tran -
sistor .
2 . Pul l ou t th e No . 1 (RED/BLK ) termina l fro m th e con -
nector .
3. Connec t a 1. 2 - 3. 4 wat t bul b a s shown , the n recon -
nec t th e 3 P connecto r t o th e powe r transistor .
4 . Tur n th e ignitio n switc h O N (II) , an d chec k tha t th e
blowe r moto r runs .
CAUTION :
• T o avoi d a loos e o r disconnecte d terminal , b e carefu l
no t t o damag e th e lockin g ta b whe n disconnectin g
an d connectin g th e terminal .
• Insulat e th e No . 1 (RED/BLK ) termina l fro m th e bod y
unti l th e testin g is completed .
12V 1.2-3. 4 WBUL B
No. 1 (RED/BLK )
No . 3 (BLU/RED )
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Relays
Test
Ther e shoul d b e continuit y betwee n th e No . 1 an d No . 3
terminal s whe n powe r an d groun d ar e connecte d t o th e
No . 2 an d No . 4 terminals , an d ther e shoul d b e n o conti -
nuit y whe n powe r i s disconnected .
Blowe r moto r rela y
Radiato r fa n rela y
Condense r fa n rela y
Compresso r clutc h rela y Blowe
r moto r hig h rela y
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Heater Valve

Test

1. Disconnect the 2P connector from the heater valve

control solenoid valve.

2. Check for continuity between the No. 1 and No. 2

terminals of the heater valve control solenoid valve.

HEATER VALVE CONTROL

SOLENOID VALVE

3. Disconnect the #2 vacuum hose from the intake

manifold, then connect a vacuum pump to the #2

vacuum hose.

HEATER VALVE CONTROL

SOLENOID VALVE

#2 VACUUM HOSE

HEATER VALVE

4. Connect battery power to the No. 2 terminal of the

heater valve control solenoid valve, and ground the

No. 1 terminal.

5. Check that the rod of the heater valve is pulled

toward the diaphragm when vacuum is applied to

the heater valve control solenoid with a vacuum

pump.

6. Check that the rod is returned to the original posi-

tion when power is disconnected.
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Evaporator
Replacemen t
1. Recove r th e refrigeran t wit h a Recovery/Recycling /
Chargin g Syste m (se e pag e 22-71 ).
2 . Remov e th e dashboar d lowe r cover , th e kne e bol -
ste r an d th e glov e bo x (se e sectio n 20 ).
3 . Remov e th e EC M (se e sectio n 11 ).
4 . Remov e th e AB S contro l uni t an d th e radiato r fa n
contro l modul e togethe r wit h th e bracket , the n
remov e th e TC M (se e sectio n 14 ). Remov e th e secu -
rity contro l unit .
5. Disconnec t th e connector s fro m th e powe r transis -
tor , blowe r moto r hig h relay , evaporato r tempera -
tur e sensor , blowe r moto r an d th e heate r sub-har -
ness , the n remov e th e blowe r moto r an d heate r sub -
harnes s connector s fro m th e brackets . Disconnec t
th e passenger' s airba g harnes s clip .
BLOWE R MOTO R HIG H RELA Y
EVAPORATO RTEMPERATUR ESENSORCONNECTO R
BLOWER MOTO R CONNECTO R
POWER TRANSISTO R
HEATER SUB-HARNES SCONNECTOR
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6. Remov e th e wir e harnes s clips , th e thre e self-tap -
pin g screw s an d th e pip e cover .
PIPE COVE R WIR
E HARNES S CLIP S
7.Remov e th e expansio n valv e covers , the n discon -
nec t th e suctio n lin e an d unbol t th e expansio n valv e
fro m th e evaporator .
NOTE : Plu g o r cap the line s immediatel y afte r dis -
connectin g the m to avoi d moistur e an d dus t con -
tamination .
EXPANSIO N VALV E COVER S
SUCTION LIN E
32 N- m (3. 3 kgf-m ,
2 4 Ibf-ft )
EXPANSIO N VALV E
2 3 N- m (2. 3 kgf-m , 1 7 Ibf-ft )
8. Disconnec t th e drai n hose , an d remov e th e seve n
self-tappin g screws . The n pul l th e evaporato r ou t o f
th e fron t passenger s sid e to remov e it .
NOTE : B e carefu l no t t o damag e th e evaporato r
fin s whe n removin g th e evaporator .
DRAIN HOS E
EVAPORATO R
9. Instal l i n th e revers e orde r o f removal . Mak e not e o f
the followin g items .
If you'r e installin g a ne w evaporator, add refrig -
eran t oi l (ND-OI L 8 } (se e pag e 22-66 ).
Replac e th e O-ring s wit h ne w one s a t eac h fit -
ting , an d appl y a thi n coa t o f refrigeran t oi l (ND -
OI L 8 ) befor e installin g them .
NOTE : B e sur e t o us e th e righ t O-ring s fo r HFC -
134 a (R-134a ) t o avoi d leakage .
B e carefu l no t t o damag e th e evaporato r fin s
whe n installin g th e evaporator.
Instal l th e expansio n valv e capillar y tub e wit h
th e capillar y tub e i n contac t wit h th e suctio n lin e
directly , an d wra p i t wit h tape .
NOTE : Mak e sur e ther e i s n o foreig n matte r
stuc k betwee n th e capillar y tub e an d th e suctio n
line.
Mak e sur e tha t ther e is n o ai r leakage .
Charg e th e syste m (se e pag e 22-82 ), an d tes t it s
performanc e (se e pag e 22-68 ).
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Evaporator
Overhaul
1. Pul l th e evaporato r temperatur e senso r ou t fro m
th e evaporato r fins .
2 . Remov e th e tw o self-tappin g screw s an d th e powe r
transistor .
3 . I f necessary , remov e th e blowe r moto r hig h relay .
4 . Remov e th e si x self-tappin g screw s fro m th e hous -
ings .
5 . Carefull y separat e th e housings , the n remov e th e
evaporator .
6. Assembl e i n th e revers e orde r o f disassembly .
Mak e not e o f followin g items .
Replac e th e O-ring s wit h ne w one s a t eac h fit -
ting , an d appl y a thi n coa t o f refrigeran t oi l (ND -
OIL 8 ) befor e installin g them .
NOTE : B e sur e t o us e th e righ t O-ring s fo r HFC -
134 a (R-134a ) t o avoi d leakage .
Reinstal l th e evaporato r temperatur e senso r t o
it s origina l location .
UPPER HOUSIN G
BLOWE R MOTO R HIG H RELA Y
Test , pag e 22-5 7
115. 5 m m (4.54 7 in )
Fro m outle t sid e
50 m m (2 in )Fro m botto m
EVAPORATO R
TEMPERATUR E
SENSO R
Test , pag e 22-5 6
EVAPORATO RBlow dir t ou t o f fin swit h compresse d air .
LOWE R HOUSIN G
POWE R TRANSISTO R
Test , pag e 22-5 6
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