1995 ACURA TL Service Repair Manual

Heater Uni t
Replacemen t
SRS component s ar e locate d i n thi s area . Revie w th e
SR S componen t locations , precautions , an d procedure s
i n th e SR S ( sectio n 24 ) befor e performin g repair s o r ser -
vice .
1 . Disconnec t th e negativ e cabl e fro m th e battery .
2 . Whe n th e engin e i s cool , drai n th e engin e coolan t
fro m th e radiato r (se e sectio n 10 ).
D o no t remov e th e radiato r ca p whe n
th e engin e i s hot ; th e engin e coolan t i s unde r pres -
sur e an d coul d severel y scal d you .
3 . Remov e th e mountin g nu t an d th e heate r valve ,
the n disconnec t th e heate r hose s fro m th e heate r
unit.
CAUTION : Engin e coolan t wil l damag e paint .
Quickl y rins e an y spille d engin e coolan t fro m paint -
e d surfaces .
NOTE : Engin e coolan t wil l ru n ou t whe n th e hose s
ar e disconnected ; drai n i t int o a clea n dri p pan .
HEATE R HOS E
(OUTLE T SIDE ) HEATE
R HOS E
(INLE T SIDE )
CLAMP S
HEATE R VALV E
6 x 1. 0 m m9.8 N- m (1. 0 kgf-m ,
7. 2 Ibf-ft )
4. Remov e th e dashboar d (se e sectio n 20 ). 5
. Remov e th e seve n mountin g bolt s an d th e steerin g
hange r beam .
8 x 1.2 5 mm22 N- m (2. 2 kgf-m , 1 6 Ibf-ft )
8 x 1.2 5 mm22 N- m (2. 2 kgf-m , 1 6 Ibf-ft ) STEERIN
G HANGE R BEA M
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
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Heater Uni t
Replacemen t (cont'd )
7. Disconnec t th e connecto r fro m th e recirculatio n
contro l motor , the n 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
8. 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 heate r sub-harnes s connec -
to r fro m th e bracket .
BLOWER MOTO R HIG H RELA Y
BLOWE R MOTO R CONNECTO R
POWERTRANSISTO R
EVAPORATO RTEMPERATUR ESENSORCONNECTO R
HEATE R SUB-HARNES S
CONNECTO R
9. Remov e th e clip s fro m th e righ t an d lef t heate r
ducts , an d th e SR S mai n harnes s clip s fro m th e
heate r unit . Remov e th e thre e self-tappin g screws,
th e si x mountin g bolts , th e bracke t an d th e heate r
unit .
6 x 1. 0 m m9.8 N- m (1. 0 kgf-m , 7. 2 Ibf-ft )
HEATE R UNI T
HEATE R DUCT S
SRS MAI N HARNES S
6 x 1. 0 m m9.8 N- m (1. 0 kgf-m , 7. 2 Ibf-ft )
10. Instal l i n th e revers e orde r o f removal . Mak e not e o f
th e followin g items .
Appl y sealan t t o th e grommets .
D o no t interchang e th e inle t an d outle t heate r
hoses . Mak e sur e tha t th e clamp s ar e secure .
Loose n th e blee d bol t o n th e engine , an d refil l
th e radiato r an d th e coolan t reservoi r wit h th e
prope r engin e coolan t mixtur e (se e sectio n 10 ).
Tighte n th e blee d bol t whe n al l th e trappe d ai r
ha s escape d an d engin e coolan t begin s t o flo w
fro m it (se e sectio n 10 ).
Mak e sur e tha t ther e is n o ai r leakage .
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Heater Cor e Replacemen t
1. Remov e th e heate r uni t (se e pag e 22-63 ).
2 . Remov e th e mod e contro l moto r (se e pag e 22-51 ).
3 . Remov e th e tw o self-tappin g screw s an d th e lef t
heate r duct .
LEFT HEATE R DUC T
4. Remov e th e self-tappin g scre w an d th e lef t ai r duct .
LEFT AI R DUC T
5. Remov e th e wir e harnes s clips , an d th e mod e con -
trol ar m wit h a flat-ti p screwdrive r a s shown .
Remove th e fiv e self-tappin g screw s an d th e lef t
sid e cover .
LEFT SID E COVE R
WIR E HARNES S CLI P
WIRE HARNES S CLI P
MOD E CONTRO L AR M
6. Remov e th e tw o self-tappin g screw s an d th e heate r
cor e cover , the n pul l ou t th e heate r core .
NOTE : B e carefu l no t t o ben d th e inle t an d outle t
pipe s durin g heate r cor e removal .
HEATER COR E
HEATE R COR E COVE R
7. Instal l i n th e revers e orde r o f removal . Mak e not e o f
the followin g items .
Make sur e tha t th e mod e contro l door s an d link -
ag e mov e smoothl y withou t binding .
Afte r reinstallin g th e mod e contro l motor , mak e
sur e th e mod e contro l moto r run s smoothl y (se e
pag e 22-51 ).
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A/C Servic e Tip s an d Precaution s
The ai r conditione r syste m use s HFC-134 a (R-134a) refrigeran t and polyalkyleneglyco l (PAG ) refrigeran t oil*, whic h are no t
compatibl e wit h CFC-1 2 (R-12 ) refrigeran t an d minera l oil . D o no t us e R-1 2 refrigeran t o r minera l oi l i n thi s system , an d d o
no t attemp t t o us e R-1 2 servicin g equipment ; damag e t o th e ai r conditione r syste m o r you r servicin g equipmen t wil l result .
* DENS O ND-OIL8 :
P/N 3889 7 - PR 7 - A01AH : 12 0 ( 4 fl-oz , 4. 2 Imp-oz )
P/N 3889 9 - PR 7 - A01 : 4 0 ( 1 1/ 3 fl-oz , 1. 4 Imp-oz )
Us e onl y servic e equipmen t tha t i s U.L.-liste d an d i s certifie d t o mee t th e requirement s o f SA E J221 0 t o remov e R-134 a
fro m th e ai r conditione r system .
CAUTION : Exposur e t o ai r conditione r refrigeran t an d lubrican t vapo r o r mis t ca n irritat e eyes , nos e an d throat . Avoi d
breathin g th e ai r conditione r refrigeran t an d lubrican t vapo r o r mist .
I f accidenta l syste m discharg e occurs , ventilat e wor k are a befor e resumin g service .
R-134 a servic e equipmen t o r vehicl e ai r conditione r system s shoul d no t b e pressur e teste d o r lea k teste d wit h compresse d air .
Som e mixture s o f ai r an d R-134 a hav e bee n show n to b e combustibl e a t elevate d pressure s an d ca n resul t
i n fir e o r explosio n causin g injur y o r propert y damage . Neve r us e compresse d ai r t o pressur e tes t R-134 a servic e equip -
men t o r vehicl e ai r conditione r systems .
Additiona l healt h an d safet y informatio n ma y b e obtaine d fro m th e refrigeran t an d lubrican t manufacturers .
1 . Alway s disconnec t th e negativ e cabl e fro m th e batter y wheneve r replacin g ai r conditionin g parts .
2 . Kee p moistur e an d dus t ou t o f th e system . Whe n disconnectin g an y lines , plu g o r ca p th e fitting s immediately ; don' t
remov e th e cap s o r plug s unti l jus t befor e yo u reconnec t eac h line .
3 . Befor e connecting any hos e o r line , appl y a fe w drop s o f refrigeran t oi l t o th e O-ring .
4 . Whe n tightenin g o r loosenin g a fitting , us e a secon d wrenc h t o suppor t th e matchin g fitting .
5 . Whe n dischargin g th e system , us e a R-134 a refrigeran t Recovery/Recycling/Chargin g System ; don' t releas e refriger -
an t int o th e atmosphere .
6 . Ad d refrigeran t oi l afte r replacin g th e followin g parts :
NOTE :
To avoi d contamination , d o no t retur n th e oi l t o th e containe r onc e dispensed , an d neve r mi x i t wit h othe r refriger -
ant oils .
Immediatel y afte r usin g th e oil , replac e th e ca p o n th e container , an d sea l i t t o avoi d moistur e absorption .
D o no t spil l th e refrigeran t oi l o n th e vehicle ; i t ma y damag e th e paint ; i f th e refrigeran t oi l contact s th e paint , was h
i t of f immediately .
Condense r ....................................... . 2 5 (5/ 6 fl-oz , 0. 9 Imp-oz )
Evaporato r ....................................... . 5 0 ( 1 2/ 3 fl-oz , 1. 8 Imp-oz )
Lin e o r hos e ..................................... . 2 0 (2/ 3 fl-oz , 0. 7 Imp-oz )
Receiver/Drye r ................................ ..... 15(1/ 2(fl-oz , 0. 5 Imp-oz )
Leakag e repai r ................................ . 2 5 (5/ 6 fl-oz , 0. 9 Imp-oz )
Compresso r ............................... . Fo r compresso r replacement , subtrac t th e volum e o f oi l draine d fro m th e
remove d compresso r fro m 16 0 ( 5 1/ 3 fl-oz , 5. 6 Imp-oz) , an d drai n th e calculate d
volume o f oi l fro m th e ne w compressor : 16 0 ( 5 1/ 3 fl-oz , 5. 6 Imp-oz ) — Volum e
o f remove d compresso r = Volum e to drai n fro m ne w compressor .
NOTE : Eve n i f n o oi l i s draine d fro m th e remove d compressor , don' t drai n mor e
than 5 0 ( 1 2/ 3 fl-oz , 1. 8 Imp-oz ) fro m th e ne w compressor .
REMOVED NE W
COMPRESSOR COMPRESSO R
SAME LEVE LDRAININ GVOLUME160 ( 5 1/ 3 fl-oz , 5. 6 Imp-oz )
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A/C Syste m Torqu e Specification s
COMPRESSO R
BRACKE T
IDLER PULLE YBRACKE T HEATER/EVAPORATOR/BLOWE
R
UNIT
SUCTIO N HOS E
-RECEIVER/DRYE R
CONDENSE R PIP E
DISCHARG E HOS E
CONDENSE R
NOTE: Whe n installin g th e compresso r bracket , tighte n th e bolt s o n th e oi l pa n first , the n thos e o n th e cylinde r bloc k (se e
page 22-73 ).
Suctio n hos e t o th e compresso r ( 6 x 1. 0 mm)...................................................................\
........ . 9. 8 N- m (1. 0 kgf-m , 7. 2 Ibf-ft )
Discharg e hos e t o th e compresso r ( 6 x 1. 0 mm)...................................................................\
.... . 9. 8 N- m (1. 0 kgf-m , 7. 2 Ibf-ft )
Discharg e hos e t o th e condenser..............................................................\
.................................... . 2 2 N- m (2. 2 kgf-m , 1 6 Ibf-ft )
Condense r pip e t o th e condenser..............................................................\
................................... . 1 3 N- m (1. 3 kgf-m , 9. 4 Ibf-ft )
Condense r pip e t o th e receiver/dryer.........................................................\
................................. . 1 3 N- m (1. 3 kgf-m , 9. 4 Ibf-ft )
Receive r pip e t o th e receiver/dryer.........................................................\
..................................... . 1 3 N- m (1. 3 kgf-m , 9. 4 Ibf-ft )
Receive r pip e t o th e evaporato r ( 6 x 1. 0 mm)...................................................................\
......... . 9. 8 N- m (1. 0 kgf-m , 7. 2 Ibf-ft )
Suctio n hos e t o th e evaporato r ( 6 x 1. 0 mm)...................................................................\
......... . 9. 8 N- m (1. 0 kgf-m , 7. 2 Ibf-ft )
Compresso r t o compresso r bracke t ( 8 x 1.2 5 mm)...................................................................\
.. . 2 2 N- m (2. 2 kgf-m , 1 6 Ibf-ft )
Compresso r bracke t t o cylinde r bloc k (1 0 x 1.2 5 mm)................................................................ . 4 9 N- m (5. 0 kgf-m , 3 6 Ibf-ft )
Idle r pulle y bracke t t o compresso r bracke t ( 8 x 1.2 5 mm)......................................................... . 2 2 N- m (2. 2 kgf-m , 1 6 Ibf-ft )
Idle r pulle y t o idle r pulle y bracke t ( 8 x 1.2 5 mm)...................................................................\
..... . 4 4 N- m (4. 5 kgf-m , 3 2 Ibf-ft )
IDLER PULLE Y
COMPRESSOR
RECEIVER PIP E
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A/C Syste m Servic e
Performanc e Tes t
The performanc e tes t wil l hel p determin e i f th e ai r con -
ditione r syste m is operatin g withi n specifications .
Us e onl y servic e equipmen t tha t i s U.L.-liste d an d is cer -
tifie d t o mee t th e requirement s o f SA E J221 0 t o remov e
HFC-134 a (R-134a ) fro m th e ai r conditione r system .
CAUTION : Exposur e t o ai r conditione r refrigeran t an d
lubrican t vapo r o r mis t ca n irritat e eyes , nos e an d
throat . Avoi d breathin g th e ai r conditione r refrigeran t
an d lubrican t vapo r o r mist .
I f accidenta l syste m discharg e occurs , ventilat e wor k
are a befor e resumin g service .
R-134 a servic e equipmen t o r vehicl e ai r conditione r sys -
tem s shoul d no t b e pressur e teste d o r lea k teste d wit h
compresse d air .
Som e mixture s o f ai r an d R-134 a hav e bee n
show n to b e combustibl e a t elevate d pressure s an d ca n
resul t i n fir e o r explosio n causin g injur y o r propert y
damage . Neve r us e compresse d ai r t o pressur e tes t R -
134 a servic e equipmen t o r vehicl e ai r conditione r sys -
tems .
Additiona l healt h an d safet y informatio n ma y b e obtaine d
from th e refrigeran t an d lubrican t manufacturers .
1 . Connec t a R-134 a refrigeran t Recover/Recycling /
Chargin g Syste m to th e vehicle , a s shown , follow -
in g th e equipmen t manufacturer' s instructions .
2 . Inser t a thermomete r i n th e cente r ven t outlet .
Determin e th e relativ e humidit y an d ai r tempera -
ture .
Recovery/Recycling/Chargin g Syste m
HIGH-PRESSUR ESIDE
3. Tes t conditions :
Avoi d direc t sunlight .
Ope n hood .
Ope n fron t doors .
Se t th e temperatur e contro l dia l o n MA X COOL ,
th e mod e contro l switc h o n VEN T an d th e recir -
culatio n contro l switc h o n RECIRCULATE .
Tur n th e A/ C switc h on , an d th e fa n switc h o n
MAX .
Run th e engin e a t 1,50 0 rpm .
N o drive r o r passenger s in vehicl e
4 . Afte r runnin g th e ai r conditionin g fo r 1 0 minute s
unde r th e abov e tes t conditions , rea d th e deliver y
temperatur e fro m th e thermomete r i n th e das h ven t
an d th e hig h an d lo w syste m pressur e fro m th e A/ C
gauges .
LOW-PRESSUR ESIDE
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5. To complete the charts:

Mark the delivery temperature along the vertical line.

Mark the intake temperature (ambient air temperature) along the bottom line.

Draw a line straight up from the air temperature to the humidity.

Mark a point one line above and one line below the humidity level (10% above and 10% below the humidity level).

From each point, draw a horizontal line across the delivery temperature.

The delivery temperature should fall between the two lines.

Complete the low side pressure test and high side pressure test in the same way.

Any measurements outside the line may indicate the need for further inspection.ProCarManuals.com

A/C Syste m Servic e
Pressur e Tes t Char t
NOTE : Performanc e Tes t i s o n pag e 22-68 .
Test result s
Discharg e (high )
pressur e abnor -
mally hig h
Discharg e pres -
sur e abnormall y
low
Suctio n (low )
pressur e abnor -
mally lo w
Suctio n pres -
sur e abnormall y
high
Suctio n an d dis -
charg e pres -
sure s abnormall y
hig h
Suctio n an d dis -
charg e pressur e
abnormall y lo w
Refrigeran t leak s
Relate d symptom s
After stoppin g compressor, pres-
sur e drop s t o abou t 20 0 kP a
(2.0 kgf/cm2, 2 8 psi ) quickly , an d
the n fall s gradually .
Reduce d o r n o ai r flo w throug h
condense r
Lin e to condense r i s excessivel y
hot.
Hig h an d lo w pressure s ar e bal -
ance d soo n afte r stoppin g compres -
sor . Lo w sid e is highe r tha n normal .
Outle t o f expansio n valv e is no t
frosted , lo w pressur e gaug e indi -
cate s vacuum .
Expansio n valv e is no t frosted , an d
low-pressur e lin e is no t cold . Low -
pressur e gaug e indicate s vacuum .
Discharg e temperatur e is low , an d
th e ai r flo w fro m vent s i s restricted .
Expansio n valv e is frosted .
Receiver/drye r outle t i s cool , an d
inle t i s war m (shoul d b e war m
durin g operation) .
Low-pressur e hos e an d chec k
join t ar e coole r tha n th e tempera -
tur e aroun d evaporator .
Suctio n pressur e is lowere d whe n
condense r i s coole d b y water .
Hig h an d lo w pressur e ar e equal -
ize d a s soo n a s th e compresso r i s
stopped , an d bot h gauge s fluctu -
ate whil e running .
Reduced ai r flo w throug h con -
denser .
Low-pressur e hos e an d meta l en d
area s ar e coole r tha n evaporator .
Temperatur e aroun d expansio n
valv e i s to o lo w compare d wit h
tha t aroun d receiver/dryer .
Compresso r clutc h i s dirty .
Compresso r bolt(s ) ar e dirty .
Compresso r gaske t i s we t wit h oil . Probabl
e caus e
Ai r i n syste m
• Clogge d condense r o r
radiato r fin s
• Condense r o r radiato r fa n
no t workin g properl y
Restricte d flo w o f refriger -
an t i n syste m
• Fault y compresso r dis -
charg e valv e
• Fault y compresso r sea l
• Fault y expansio n valv e
• Moistur e i n syste m
• Froze n expansio n valv e
• Fault y expansio n valv e
Froze n evaporato r
Clogge d expansio n valv e
Clogge d receiver/drye r
• Expansio n valv e ope n to o
lon g
• Loos e expansio n capillar y
tub e
Excessiv e refrigeran t i n sys -
tem
• Fault y gaske t
• Fault y hig h pressur e valv e
• Foreig n particl e stuc k in
high-pressur e valv e
• Clogge d condense r o r
radiato r fin s
• Condense r o r radiato r fa n
no t workin g properl y
Clogge d o r kinke d lo w pres -
sur e hos e part s
Clogge d high-pressur e lin e
Compresso r shaf t sea l leakin g
Leakin g aroun d bolt(s )
Gaske t leakin g Remed
y
Recover , evacuate , an d
recharg e wit h specifie d amount .
Evacuation : se e pag e 22-8 1
Charging : se e pag e 22-8 2
• Clean .
• Chec k voltag e an d fa n rpm .
• Chec k fa n direction .
Restricte d line s
Replac e th e compressor .
• Replace .
• Recover , evacuate , an d
recharg e wit h specifie d
amount .
Replac e th e expansio n valve .
Run th e fa n wit h compresso r
off, the n chec k A/ C thermostat .
Clea n o r replace .
Replace .
Repair o r replace .
Recover , evacuate , an d
recharg e wit h specifie d amount .
Replac e th e compressor .
• Clea n condense r an d radia -
tor.
• Chec k voltag e an d fa n rpm .
• Chec k fa n direction .
Repai r o r replace .
Repai r o r replace .
Replac e th e compressor .
Tighte n bolt(s ) o r replac e com -
pressor .
Replac e th e compressor .
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