1997 ACURA NSX Service Repair Manual

Relief Valve Replacement

1. Remove the relief valve and O-ring.

Don't let any refrigerant oil run out.

NOTE: Be sure to use the right O-rings for R-134a.

O-RING

Replace.

RELIEF VALVE

13.2
N-m

(1.35 kgf-m, 9.76 Ibf-ft)

2. Clean off the mating surface.

3. Replace O-ring with new one at the relief valve, and

apply refrigerant oil (ND-OIL 8) to it.

NOTE:

• Do not return the oil to the container once

dispensed and never mix with other refrigerant

oils to avoid contamination.

• Immediately after using the oil, replace the cap

on the container and seal it to avoid moisture

absorption.

• Do not spill the refrigerant oil on the vehicle; it

may damage the paint; if the refrigerant oil con-

tacts the paint, wash it off immediately.

4. Install and tighten the relief valve.

5. Charge the system and check for leaks.ProCarManuals.com

Belt Adjustmen t
Deflection Metho d
1 . Appl y a forc e o f 9 8 N (1 0 kgf , 2 2 Ibf ) an d measur e
the deflectio n betwee n th e A/ C compresso r an d th e
crankshaf t pulley .
A/ C Compresso r Bel t
Use d Belt :
10-1 2 mm (0.39-0.4 7 in)
Ne w Belt : 5.5-7. 5 mm (0.22-0.3 0 in)
NOTE :
• I f ther e ar e crack s o r an y damag e eviden t o n th e
belt , replac e it wit h a ne w one .
• "Use d belt " mean s a bel t whic h ha s bee n use d
fo r fiv e minute s o r more .
• "Ne w belt " mean s a bel t whic h ha s bee n use d
fo r les s tha n fiv e minutes .
2 . Loose n th e adjustin g pulle y nu t an d th e adjustin g
bolt .
3 . Tur n th e adjustin g bol t t o ge t prope r bel t tension ,
the n retighte n th e adjustin g pulle y nut .
4 . Rechec k th e deflectio n o f th e A/ C compresso r belt .
ADJUSTIN G BOL T
COMPRESSO RBELTIDLE R PULLE Y CENTE R NU T44 N- m (4. 5 kgf-m , 3 3 Ibf-ft )
Tensio n Gaug e Metho d
1 . Attac h th e bel t tensio n gaug e t o th e A/ C compres -
sor bel t a s show n below , an d measur e th e tensio n
of th e belt .
A/ C Compresso r Bel t
Use d Belt : 34 0 - 54 0 N (3 5 - 5 5 kgf ,
77 - 12 0 Ibf )
New Belt : 69 0 - 88 0 N (7 0 - 9 0 kgf ,
150 - 20 0 Ibf )
NOTE :
• I f ther e ar e crack s o r an y damag e eviden t o n th e
belt , replac e it wit h a ne w one .
• Follo w th e manufacturer' s instruction s fo r th e
bel t tensio n gauge .
• "Use d belt " mean s a bel t whic h ha s bee n use d
for fiv e minute s o r more .
• "Ne w belt " mean s a bel t whic h ha s bee n use d
fo r les s tha n fiv e minutes .
2 . Loose n th e adjustin g pulle y nu t an d th e adjustin g
bolt .
3 . Tur n th e adjustin g bol t t o ge t prope r bel t tension ,
the n retighte n th e adjustin g pulle y nut .
4 . Rechec k th e tensio n o f th e A/ C compresso r belt .
BELT TENSIO N GAUG E07JGG - 001010 A
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A/C System Service

Evacuation

Only use service equipment that is U.L.-listed and is cer-

tified to meet the requirements of SAE J2210 to remove

HFC-134a (R-134a) from the air conditioning system.

CAUTION: Exposure to air conditioner refrigerant

and lubricant vapor or mist can irritate eyes, nose

and throat. Avoid breathing the air conditioner

refrigerant and lubricant vapor or mist.

If accidental system discharge occurs, ventilate work

area before resuming service.

R-134a service equipment or vehicle air conditioning sys-

tem should not be pressure tested or leak tested with

compressed air.

Some mixtures of air and R-134a have

been shown to be combustible at elevated pressures

and can result in fire or explosion causing injury or

property damage. Never use compressed air to pres-

sure test R-134a service equipment or vehicle air

conditioning systems.

Additional health and safety information may be obtained

from the refrigerant and lubricant manufacturers.

1. When an A/C System has been opened to the at-

mosphere, such as during installation or repair, it

must be evacuated using a R-134a refrigerant

Recovery/Recycling/Charging System. (If the

system has been open for several days, the

receiver/dryer should be replaced).

2. Connect a R-134a refrigerant Recovery/Recycl-

ing/Charging System to the vehicle as shown follow

the equipment manufacturer's instructions.

NOTE: If low pressure does not reach more than

93.3 kPa (700 mmHg, 27.6 in.Hg) in 15 minutes,

there is probably a leak in the system. Partially

charge the system and check for leaks (see Leak

Test).
Recovery/Recycling/Charging SystemProCarManuals.com

A/C Syste m Servic e
Leak Tes t
Only us e 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 conditionin g 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-134a servic e equipmen t o r vehicl e ai r conditionin g sys -
tem 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 pres -
sur e tes t R-134 a servic e equipmen 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 . Connec t a R-134 a refrigeran t Recovery/Recycl -
ing/Chargin g Syste m to th e vehicl e a s show n fol -
lowin g th e equipmen t manufacturer' s instructions .
NOTE: B e sur e t o instal l th e sam e amoun t o f ne w
refrigeran t oi l bac k int o th e A/ C syste m befor e
charging .
2 . Ope n hig h pressur e valv e t o charg e th e syste m to
abou t 9 8 kP a (1. 0 kgf/cm2, 1 4 psi) , the n clos e th e
suppl y valve .
3 . Chec k th e syste m fo r leak s usin g a R-134 a refriger -
an t lea k detecto r wit h a n accurac y o f 1 4 g (0, 5 oz )
pe r yea r o r better .
4. I f yo u fin d leak s tha t requir e th e syste m to b e open -
ed (t o repai r o r replac e houses , fittings , etc.) ,
recove r th e syste m accordin g t o th e Recove r Pro -
cedur e o n pag e 22-73 ).
5 . Afte r checkin g an d repairin g leaks , th e syste m
mus t b e evacuate d (se e Syste m Evacuatio n o n
pag e 22-89 ).
Recovery/Recycling/Chargin g Syste m
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Charging

Only use service equipment that is U.L.-listed and is

certified to meet the requirements of SAE J2210 to

remove HFC-134a (R-134a) from the air conditioner

system.

CAUTION: Exposure to air conditioner refrigerant

and lubricant vapor or mist can irritate eyes, nose

and throat. Avoid breathing the air conditioner

refrigerant and lubricant vapor or mist.

If accidental system discharge occurs, ventilate work

area before resuming service. Additional health and safe-

ty information may be obtained from the refrigerant and

lubricant manufacturers.

Refrigerant capacity: 850

CAUTION: Do not overcharge the system; the

compressor will be damaged.

Connect a R-134a refrigerant Recovery/Recycling/

Charging System to the vehicle as shown follow the

equipment manufacturer's instructions.
Recovery/Recycling/Charging SystemProCarManuals.com

Special Tool s
23-244, 23-246
23-109
23-132
23-252, 23-309
23-91
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Troubleshooting

Tips and Precautions

Before Troubleshooting

Check applicable fuses in the appropriate fuse box.

Check the battery for damage, state of charge, and

clean and tight connections.

Check the alternator belt tension.

CAUTION:

Do not quick-charge a battery unless the battery

ground cable has been disconnected.

Otherwise you will damage the alternator

diodes.

Do not attempt to crank the engine with the bat-

tery ground cable loosely connected or you will

severely damage the wiring.

Handling Connectors

Make sure the connectors are clean and have no loose

wire terminals.

Make sure multiple cavity connectors are packed with

grease (except watertight connectors).

All connectors have push-down release type locks.

LOCKING TAB

Some connectors have a clip on their side used to at-

tach them to a mount bracket on the body or on

another component. This clip has a pull type lock.

Some mounted connectors cannot be disconnected

unless you first release the lock and remove the con-

nector from its bracket.

(21

LOCKING'

PAWL ON

OTHER

HALF OF

CONNECTOR
Pull to

disengage

BRACKET
Never try to disconnect connectors by pulling on their

wires; pull on the connector halves instead.

Always reinstall plastic covers.

Before connecting connectors, make sure the ter-

minals are in place and not bent.

BENT TERMINAL

Check for loose retainer and rubber seals.

RETAINER
RUBBER SEAL RETAINER

The backs of some connectors are packed with

grease. Add grease if needed. If the grease is con-

taminated, replace it.

(cont'd)ProCarManuals.com

Troubleshooting

Tips and Precautions (cont'd)

Insert the connector all the way, and make sure it is

securely locked.

Position wires so that the open end of the cover

faces down.

Face

open end

down

Handling Wires and Harnesses

Secure wires and wire harnesses to the frame with

their respective wire ties at the designated locations.

Remove clips carefully; don't damage their locks.

Slip pliers under the clip base and through the hole at an

angle, then squeeze the expansion tabs to release the

clip.

After installing harness clips, make sure the harness

doesn't interfere with any moving parts.

Keep wire harnesses away from exhaust pipes and

other hot parts, from sharp edges of brackets and

holes, and from exposed screws and bolts.
Seat grommets in their grooves properly.

NOT GOOD

Testing and Repairs

Do not use wires or harnesses with broken insulation.

Replace them or repair them by wrapping the break

with electrical tape.

After installing parts, make sure that no wires are

pinched under them.

When using electrical test equipment, follow the

manufacturer's instructions and those described in

this manual.

If possible, insert the probe of the tester from the wire

side (except waterproof connector).

Use a probe with a tapered tip.

Refer to the instructions in the Honda Terminal Kit for

identification and replacement of connector terminals.
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