1995 ACURA TL Service Repair Manual

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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Blower Uni t
Replacemen t
1. Remov e th e evaporato r (se e pag e 22-58 ).
2 . Remov e th e mountin g nu t fro m th e blowe r unit .
NOTE : Whe n removin g th e mountin g nut , tak e car e
no t t o damag e o r ben d th e fue l pipes , brak e pipes ,
etc.
8 x 1.2 5 mm12 N- m (1. 2 kgf-m , 8. 7 Ibf-ft )
3. Disconnec t th e connecto r fro m th e recirculatio n
contro l motor , an d remov e th e self-tappin g scre w
fro m th e pip e clamp .
PIPE CLAM P
RECIRCULATIO N CONTRO L MOTO R
4. Remov e th e mountin g bolt , the n remov e th e blowe r
unit b y movin g it bac k an d towar d th e right .
6 x 1. 0 m m9.8 N- m (1. 0 kgf-m , 7. 2 Ibf-ft )
BLOWE R UNI T
5. I f necessary , remov e th e thre e self-tappin g screws ,
th e recirculatio n contro l moto r an d th e flang e collar .
RECIRCULATIO N CONTRO L MOTO R
FLANG E COLLA R
6. Instal l i n th e revers e orde r o f removal . Mak e not e o f
th e followin g items .
Mak e sur e tha t th e recirculatio n contro l door s
an d linkag e mov e smoothl y withou t binding .
Afte r reinstallin g th e recirculatio n contro l motor ,
mak e sur e th e recirculatio n contro l moto r run s
smoothl y (se e pag e 22-52 ).
Mak e sur e tha t ther e is n o ai r leakage .
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Blower Unit

Overhaul

1. Remove the air filter.

2. Remove the three self-tapping screws and the

seven clamps from the housings.

3. Carefully separate the housings.

4. Remove the two self-tapping screws and the blower

motor.
5. Assemble in the reverse order of disassembly.

Make note of following items.

Make sure that the recirculation control doors

and linkage move smoothly without binding.

When assembling, be sure to install the air hose

of the blower motor to the housings as shown.

UPPER HOUSING

AIR HOSE

AIR FILTER

LOWER HOUSING
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