Subaru XT 1988 Service Manual page 1065

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Noisy
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Insufficient cooling
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Compressor OFF
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Compressor ON
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Bubbles in sight glass
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No bubbles in sight glass
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Blower makes Compressor When engine Check refrigeration line With manifold gauge, check system pressures.
noise. itself makes
rpm is changed,
for gas leaks, and repair Measure temperature of discharge air.
Repair or re- noise. there are reso- leaks if any. Charge Refer to "Performance Test".
place blower. Repair or nant sounds. refrigerant to correct
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replace com- Retighten com- level. In case of too Temperature of
pressor. pressor bracket many leaks, stop com- outside air
21 (70) 26.5 (SO)
bolts. pressor, discharge the
°c
(OF)
Bearings of com pres-
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Piping is resc- system, evacuate and
1,961 - 2,746 2,256 - 3,236
sor clutch or idler
nating. Add recharge the system.
Suction pressure
(20 - 28,
(23 -33,
pulley make noise.
cramp. As necessary, replace
kPa (kg/cm 2 ,
psi)
284 - 398) 327 - 469)
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Belt is loose. receiver drier.
Repair.
Adjust belt.
13,534 - 16,476 14,907 -18,143
Air in system may
Head pressure
cau. bubbles in sight
kPa
(kg/cm2~
psi)
(138-168, (152 - 185,
glass.\
1,962 - 2,389) 2,161 - 2,631)
Temperature
difference (Outside
10 - 13.5 10.5 -14.5
air - discharge air!
°c
(OF)
(50 - 56) (51 - 58)
•
Engine speed : 1,500 rpm
•
Fan switch : Highest position
•
Mode switch : AlC MAX (USA model)
System pressure and temperature of discharge air are
Temperature of discharge
abnormal. Refer to "Performance Test Diagnoses" air is abnormal, but system
for detail. pressure is normal.
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Suction pressure is low.
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Head pressure is
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Suction pres-
Suction pressure is
Check air flow
system.
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sure is high. high.
high, while head is Refer to "4-6 HEATER
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low.
AND VENTILATOR".
Pipe at receiver
Fin and tube of Expansion valve is Overcharge of refrigerant.
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drier outlet has evaporator have
open excessively, Discharge some of refrig-
low temperature.
some dents. or expansion erant to correct level.
Receiver drier is Replace or repair O-ring is damaged.
Air is mixed in. Discharge
Valve or gasket of
restricted. Replace
evaporator. Replace expansion
system, and replace drier.
compressor is dam-
raceiver drier.
valve.
Evacuate and recharge
aged.
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Repair or replace
Expansion valve is
system.
compressor.
close excessively,
Condenser's fin is dented
or gas leakage from
or clogged with dust.
thermo bulb.
Clean exterior surface
Replace expansion
with_ter.
valve.
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Blower does not Compressor
rotate. does not run.
Refer to "Blower Refer to "Com-
Motor pressor
Diagnoses". Diagnoses".
32 (90) J8 (100)
2,746 - 3,727 3,629 - 4,707
128-38,
(37 - 48,
398 - 540) 526- 683)
17,162 - 20,497 19,712 - 23,046
(175 - 209, (201 - 235,
2,489 - 2,972) 2,858 - 3,342)
13 -17 15 - 19.5
(55- 63) (59-67)
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Check grommets on car's dash panel
for air leaks; check other seals of
car.
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