ACURA RL KA9 1996 Service Repair Manual

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 i s 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
fro m th e refrigeran t an d lubrican t manufacturers .
1 . Connec t a R-134 a refrigeran t recover/recycling /
chargin g statio n t o th e vehicle , a s shown , followin g
th e equipmen t manufacturer' s instructions .
2 . Inser t a thermomete r i n th e cente r ai r vent . Deter -
min e th e relativ e humidit y an d ai r temperature .
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 i n 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 .
RECOVERY/RECYCLING/CHARGIN G STATIO N
LOW-PRESSUR ESIDE
HIGH-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.

DELIVERY

PRESSURE
DELIVERY

PRESSURE

DELIVERY

TEMPERATURE
HUMIDITY

LEVEL

HUMIDITY

LEVEL

HUMIDITY

LEVEL

DELIVERY

TEMPERATURE

INTAKE TEMPERATURE
INTAKE

PRESSUREProCarManuals.com

A/C Syste m Servic e
Pressur e Tes t Char t
NOTE : Performanc e Tes t i s o n pag e 22-76 .
Test result s
Discharg e (high )
pressur e abnor -
mall y 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/cm
2, 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 , low-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 .
Reduce d 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 in syste m
• Froze n expansio n valv e
• Fault y expansio n valv e
Froze n evaporato r
Clogged 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 high-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 low -
pressur 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 8
Charging : se e pag e 22-8 9
• 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 .
Ru n th e fa n wit h compresso r
off , the n chec k evaporato r
temperatur e sensor .
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 .
Replace th e compressor .
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Compressor
Replacemen t
1. I f th e compresso r i s marginall y operable , ru n th e
engin e a t idl e speed , an d le t th e ai r conditione r
wor k fo r a fe w minutes , the n shu t th e engine off.
2 . Mak e sur e yo u hav e th e anti-thef t cod e fo r th e radio ,
the n writ e dow n th e frequencie s fo r th e radio' s pre -
se t buttons .
3 . Disconnec t th e negativ e cabl e fro m th e battery .
4 . Recove r th e refrigeran t wit h a recovery/recycling /
chargin g statio n (se e pag e 22-75 ).
5 . Loose n th e A/ C compresso r bel t (se e pag e 22-85 ).
A/ C COMPRESSO R BEL T
6. Remov e th e nuts , the n disconnec t th e suctio n lin e
an d th e discharg e lin e fro m th e compressor .
NOTE : Plu g o r ca p th e line s immediatel y afte r dis -
connectin g the m to avoi d moistur e an d dus t con -
tamination .
SUCTION LIN E
DISCHARG E LIN E
6 x 1. 0 m m9.8 N- m (1. 0 kgf-m ,
7 Ibf-ft )
7. Remov e th e mountin g bolt s an d th e compressor .
8 x 1.2 5 mm22 N- m (2. 2 kgf-m , 1 6 Ibf-ft )
8. Remov e th e bolt s an d th e suctio n servic e valv e
fro m th e compressor .
25.5 N- m (2. 6 kgf-m , 18. 8 Ibf-ft )
SUCTIO N SERVIC E
VALV E
O-RIN G
Replace .
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Compressor
Replacemen t (cont'd )
9. Remov e th e mountin g bolt s an d th e idle r pulley .
IDLER PULLE Y
MOUNTIN G BOLT S
10. Chec k th e idle r pulle y bearin g fo r pla y an d drag .
Replac e it wit h a ne w on e i f it' s nois y o r ha s exces -
siv e pla y o r drag .
ADJUSTIN GBOLT
IDLE RPULLE YCENTE RBOLT
10 x 1.2 5 mm44 N- m (4. 5 kgf-m , 3 3 Ibf-ft )
11. Instal l i n th e revers e orde r o f removal . Mak e not e o f
th e followin g items .
I f you'r e installin g a ne w compressor , drai n al l
th e refrigeran t oi l fro m th e remove d compressor ,
an d measur e it s volume . Subtrac t th e volum e o f
draine d oi l fro m 14 0 m ( 4 2/ 3 fl-oz , 4. 9 Imp-oz) ;
th e resul t i s th e amoun t o f oi l yo u shoul d drai n
fro m th e ne w compresso r (throug h th e suctio n
fitting).
Replac e th e O-ring s wit h ne w one s a t eac h fitting ,
an d appl y a thi n coa t o f refrigeran t oi l befor e
installin g them .
NOTE : B e sur e t o us e th e righ t O-ring s fo r HFC -
134a (R-134a ) t o avoi d leakage .
Use refrigeran t oi l (ND-OI L 8 ) fo r R-134 a DENS O
piston typ e compressor s only .
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 refrigeran t oils .
Immediatel y afte r usin g th e oil , reinstal l 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 con -
tact s th e paint , was h it of f immediately .
Adjus t th e A/ C compresso r bel t (se e pag e 22-85 ).
Charg e th e syste m (se e pag e 22-89 ), an d tes t it s
performanc e (se e pag e 22-76 ).
Th e PC M memor y mus t b e rese t afte r reconnect -
in g th e batter y (se e pag e 11-125 ).
Ente r th e anti-thef t cod e fo r th e radio , the n ente r
th e customer' s radi o statio n presets .
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Illustrated Inde x
CENTE R BOL T
PRESSUR E PLAT E
Inspection , pag e 22-8 2
SHIM(S )
SNAP RIN G B
Replace .
PULLE Y
Inspection , pag e 22-8 2
SNA P RIN G A
Replace .
FIEL D COI L
Inspection , pag e 22-8 2
RELIE F VALV E
Replacement ,
page 22-8 4O-RIN GReplace .
SUCTION SERVIC E VALV E
O-RIN
G
Replace . COMPRESSO
R
(Do no t disassemble )
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Compressor
Clutch Inspectio n
Check th e plate d part s o f th e pressur e plat e fo r colo r
changes , peelin g o r othe r damage . I f ther e i s dam -
age , replac e th e clutc h set .
Chec k th e pulle y bearin g pla y an d dra g b y rotatin g
th e pulle y b y hand . Replac e th e clutc h se t wit h a ne w
on e if i t i s nois y o r ha s excessiv e play/drag .
PULLEY
Measur e th e clearanc e betwee n th e pulle y an d th e
pressur e plat e al l th e wa y around . I f th e clearanc e i s
no t withi n specifie d limits , th e pressur e plat e mus t b e
remove d an d shim s adde d o r remove d a s required ,
followin g th e procedur e o n pag e 22-83 .
Clearance : 0. 5 ±0.1 5 m m (0.02 0 ± 0.00 6 in )
NOTE : Th e shim s ar e availabl e in thre e thicknesses :
0.1 mm , 0. 3 m m an d 0. 5 mm .
PRESSUR E PLAT EPULLE Y
Check resistanc e o f th e fiel d coil .
Field Coi l Resistance : 3. 4 to 3. 8 a t 6 8 F (20°C )
I f resistanc e i s no t withi n specifications , replac e th e
fiel d coil .
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Clutch Overhau l
1. Remov e th e cente r bol t whil e holdin g th e pressur e
plate .
CENTE R BOL T13.2 N-m(1.3 5 kgf-m , 9.7 6 Ibf-ft )
A/ C CLUTC H HOLDE R
(Commerciall y available )
Robinair: P/N 1020 4Kent-Moore : P/ N J3787 2
2. Remov e th e pressur e plat e an d shim(s) , takin g car e
no t t o los e th e shim(s) .
PRESSUR E PLAT E
SHIM(S )
3. Remov e th e sna p rin g B wit h sna p rin g pliers , the n
remov e th e pulley .
NOTE:
B e carefu l no t t o damag e th e pulle y an d com -
presso r durin g removal/installation .
Once th e sna p rin g B is removed , replac e it wit h
a ne w one .
SNA P RIN G B
Replace .
PULLE Y
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Compressor
Clutch Overhau l (cont'd )
4. Remov e th e scre w fro m th e fiel d coi l groun d termi -
nal . Remov e th e sna p rin g A wit h sna p rin g pliers ,
the n remov e th e fiel d coil .
NOTE :
• B e carefu l no t t o damag e th e fiel d coi l an d com -
presso r durin g removal/installation .
• Onc e th e sna p rin g A is removed , replac e it wit h
a ne w one .
SNA P RIN G AReplace .
FIELD COI L
5. Instal l i n th e revers e orde r o f removal . Mak e not e o f
th e followin g items .
• Instal l th e fiel d coi l wit h th e wir e sid e facin g
dow n (se e above) .
• Clea n th e pulle y an d compresso r slidin g surface s
wit h non-petroleu m solvent .
• Mak e sur e th e sna p ring s ar e full y seate d i n th e
groove .
• Mak e sur e tha t th e pulle y turn s smoothl y afte r
it' s reassembled .
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Compressor
Relief Valv e Replacemen t
1. Remov e th e relie f valv e an d th e O-ring .
NOTE:
• D o no t le t th e compresso r oi l ru n out .
• Mak e sur e tha t n o foreig n matte r enter s th e sys -
tem.
O-RIN GReplace .
RELIEF VALV E13.2 N- m (1.3 5 kgf-m , 9.7 6 Ibf-ft )
2. Clea n th e matin g surfaces .
3 . Replac e th e O-rin g wit h a ne w on e a t th e relie f valve ,
an d appl y a thi n coa t o f refrigeran t oi l befor e installin g
it.
NOTE :
• T o 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 refrigeran t oils .
• Immediatel y afte r usin g th e oil , reinstal l th e ca p
o n th e container , an d sea t 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 con -
tact s th e paint , was h i t of f immediately .
4 . Instal l an d tighte n th e relie f valve .
5 . Charg e th e syste m (se e pag e 22-89 ), an d tes t it s
performanc e (se e pag e 22-76 ).
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