A/C System Service
Pressure Test Chart
NOTE: Performance Test is on page 22-56.
Test resultsRelatad symptomsPrcbable caus€Remody
Discharge (high)pressure 6bnormallyhagh
After stopping compressor, pressuredrops to about 200 kPa 12.0 kgtlcm,,28 psi) quickly, and then lalls gradualty.
Air in systemDischarge, evacuate, and rechargewith specified amount.Evacuation: see page 22-60Charging: see page 22-61No bubbles in sight glass whencondenser is cooled by waterExcessive refrigerant in systemDischarge, evacuate, and rechargewith specilied amount.Reduced or no air flow throughcondenser. Clogged condenser or radia-tor fins. Condenser or radiator fannot wo.king properly
CleanCheck voltage and fan rpm.Check fan direction.
Line to condensor is excossivelv hot.Restricted flow of relrigerant insy$emFestricted lines
Discharge pressureabnormally lowExcessive bubbles in sight glass;condenser is not hot.Insufficient retrigerant inCheck for leak.Charge system.High and low pressures are balancedsoon after stopping compressor. Lowside is higher than normal.
. Faulty compressor discharge
. Faulty compressor seal
Replace the comprossor.
Outlet ot expansion valve is notfrosted, low-pressure gauge indicates
' Faulty expansion valve. Moisture in system. Replace. Discharge, evacuate, andrecharge with specified amount.Suction {low) pros,sure abnormallyExcessive bubbles in sight glass;condenser is not hot.Insufficiont relrigerant inRepair the leaks.Discharge, evacuate, andrecharge with specified amount.Charge as r€quired.Expansion valve is not frosted, andlow-pressure line is not cold. Low-pressure gauge indicates vacuum.
' Frozen expansion valvelMoisture in system). Faulty expansion valve
. Discharge, evacuate, andrecharge with specitied amount.. Replace th€ expansion valve.Discharge temperature is low, and theair llow trom vents is restricted.Frozen evaporatorRun the fan with compressor off,then check evaporator tempera,ture sensor.Expansion valve is frosted.Clogged expansion valveClean or replace.Feceiver/dryer outlet is cool, and inlotrs w6rm (should be warm duringoperation).
Clogged receiver/dryerReplace
Suction pressureabnormally highLow-pressure hose and check joint arecooler than tho temperature aroundevaporator.
. Expansion valve open too long. Loose expansion capillarytube
Repair or roplace.
Suction pressure is lowored whencondenser is cooled by water.Excessive refrigerant in systemDischarge, evacuate, and rechargewath specified amount.High and low-pressure are equalizedas soon as tho compressor is stopped,and both gauges tluctuate whilerunning.
Faulty gasketFaulty high-pressure valveForeign panicle stuck in high-
Replace the compressor.
Slction and dis,charge pressutesabnormally high
Reduced air flow through condens€r,. Clogged condenser orradiator tins. Condenser or radiator fannot working properly
CleanCheck voltage and fan rpm.Check Ian direction.
No bubbles in sight glass whencondenser is cooled by walerExcessive refrigerant jn systemDischarge, evacuate, and rechargewith specified amount.Suction and dis-charge pressureabnormally low
Low-pressure hose and motalendareas are cooterlhan evaporator.Clogged or kinked low-pressure hose pansRepair or replace.
Temperature around expansion valvers too low compared with that aroundClogged high-pressure lineRepair or replace.
Refrigerant leaksCompressor clutch is diny.Compressor shaft seal leakingReplace the compressor.Compressor boltls) are dirty.Leaking around bolt(s)Tighton bolt{s) or replacecompressor.Compressor gasket is wet with oil.Gasket leakingReplace the compressor,
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Compressor
Replacement
lf the compressor is marginally operable. run the
engine at idie speed, and let the air conditioner
work for a few minutes. then shut the engine off.
Disconnect the negative cable from the battery.
Recover the refrigerant with a recovery/recycling/
charging station (see page 22-59).
Disconnect the condenser fan connector. Remove
the compressor clutch connector and the wire har-
ness clip from the condenser fan shroud, then dis-
connect the compressor clutch connector. Remove
the mounting bolts and the condenser fan shroud,
CONDENSER FANCONNECTOR
6x1.0mm7 N.m 10.7 kg{.m, 5 lbl.ftl
'L
2.
5. Remove each bolt, then disconnect the suction and
discharge lines from the compressor. Plug or cap
the lines immediately after disconnecting them to
avoid moisture and dust contamination,
6x1.0mm9.8 N.m 11.0 kgf.m,7.2 lbf.ft)
DISCHARGE LINE
Remove the power steering pump belt (see section
17t.
Loosen the pivot bolt of the idler pulley bracket and
the adiusting bolt, then remove the Ay'C compressor
belt from the pulleys. lf necessary, remove themounting bolts from the left front mount, thenremove the A,/C compressor belt through the gap
between the bodv and the left front mount.
6.
7.
PIVOT BOLT10 x 1.25 mmAIUUSTING 4,t N.m (4.5 kgf.m, 33 tbf.ftlt€FTFRONTMOUltlT
10x 1.25 mm COMPRESSOR/t4 N.m (4.5 kgl.m,33 lbtftl BELI
LINE
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Compressor
Glutch Overhaul
1. Remove the center nut while holding the armature
plate with the tool.
A,/C CLUTCH HOLOERlCommerciallY .vailable)Robinair: P/N 1020,0Ked-Mooro: P/N J37872
CENTER NUT17.6 N.m ('1.8 kgf.m, 13lbfft)Reolace. \
i
2. Remove the armature plate by pulling it up by hand.
ARMATURE PLATE
sHtMls)Replace.
za:s
(i@,
22-66
3. Remove the snap ring B with snap ring pliers. Be
careful not to d8mage the rotor pulley and com-
pressor.
SNAP RING BR6place.
Remove the rotor pulley from the shaft with the
tools. Be sure the claws ot the puller are on the back
of the rotor pulley, not on the belt area; otherwise
the rotor pulley can be damaged.
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