ect LEXUS SC300 1991 Service Repair Manual

RECEIVER
ON±VEHICLE INSPECTION
1. REMOVE THE HEADLIGHT ON THE VEHICLE'S LEFTSIDE
See page BE±37
2. INSPECT FITTINGS FOR LEAKAGE Using a gas leak tester, check for leakage.
If there is leakage, check the tightening torque at the joints.
3. INSTALL HEADLIGHT See page BE±37
REMOVAL OF RECEIVER
1. REMOVE THE HEADLIGHT ON THE VEHICLE'S LEFT
SIDE
See page BE±37
2. RECOVER REFRIGERANT IN REFRIGERATION SYSTEM See page AC±16
3. REMOVE TWO LIQUID TUBES FROM RECEIVER Remove the two bolts and both the tubes from the receiver.
4. REMOVE RECEIVER FROM RECEIVER HOLDER Remove the bolt, then remove the receiver from the receiver
holder.
NOTICE: Cap the open fittings immediately to keep mois-
ture out of the system.
AC±118
±
AIR CONDITIONING SYSTEM Receiver
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INSTALLATION OF RECEIVER
1. INSTALL RECEIVER IN RECEIVER HOLDERInstall the receiver in the receiver holder with the one bolt.
2. INSTALL TWO LIQUID TUBES ON RECEIVER Install the two liquid tubes on the receiver with the two bolts.
Specified torque: 5.4 N Vm (55 kgf Vcm, 4 ft Vlbf)
NOTICE: Do not remove the caps until the tubes are con-
nected.
3. REPLENISH COMPRESSOR OIL IF RECEIVER HAS BEEN REPLACED
Add 20 cc (0.7 fl.oz.)
Compressor oil: ND OIL 6,
SUNISO NO. 5 GS or equivalent
4. EVACUATE AIR IN REFRIGERATION SYSTEM ANDCHARGE WITH REFRIGERANT
See page AC±17
Specified amount: 950 + 50 g (33.44 + 1.76 oz)
5. INSPECT FOR LEAKAGE OF REFRIGERANT
Using a gas leak tester, check for leakage of refrigerant.
If there is leakage, check the tightening torque at the joints.
6. INSPECT A/C OPERATION
7. INSTALL HEADLIGHT See page BE±37
±
AIR CONDITIONING SYSTEM ReceiverAC±119
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CONDENSER
ON±VEHICLE INSPECTION
1. INSPECT CONDENSER FINS FOR BLOCKAGE OR
DAMAGE
If the fins are clogged, wash them with water and dry with
compressed air.
NOTICE: Be careful not to damage the fins.
If the fins are bent, straighten them with a screwdriver or pli-
ers.
2. INSPECT CONDENSER AND FITTINGS FOR LEAKAGE Using a gas leak tester, check for leakage.
If there is leakage, check the tightening torque at the joints.
REMOVAL OF CONDENSER
1. RECOVER REFRIGERANT IN REFRIGERATION SYSTEMSee page AC±16
2. REMOVE BATTERY
3. REMOVE CONDENSER UPPER COVER AND RADIATOR FITTING BOLT
4. REMOVE UNDER COVER AND AIR FLOW COVER
5. REMOVE LIQUID TUBE AND SUCTION TUBE Remove two bolts and both tubes.
NOTICE: Cap open the fittings immediately to keep mois-
ture out of the system.
6. REMOVE CONDENSER Remove two nuts and lean the radiator backward, then re-
move the condenser.
AC±120
±
AIR CONDITIONING SYSTEM Condenser
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INSTALLATION OF CONDENSER
1. INSTALL CONDENSERInstall the condenser with two nuts.
2. INSTALL LIQUID TUBE AND DISCHARGE TUBE
Install both tubes with two bolts.
Specified torque:
Discharge tube 10 N Vm (100 kgf Vcm, 7 ft Vlbf)
Liquid tube 10 N Vm (100 kgf Vcm, 7 ft Vlbf)
NOTICE: Don't remove caps until the tube is installed.
3. IF CONDENSER WAS REPLACED, ADD COMPRESSOR OIL TO COMPRESSOR
ADD 40±50 cc (1.4±1.7 ft.oz.)
Compressor oil: ND OIL 6,
SUNISO NO. 5 GS or equivalent
4. EVACUATE AIR IN REFRIGERATION SYSTEM ANDCHARGE WITH REFRIGERANT
See page AC±17
Specified amount: 950 + 50 g (33.44 + 1.76 oz)
5. INSPECT FOR LEAKAGE OF REFRIGERATN
Using a gas leak tester, check for leakage of refrigerant.
6. INSTALL REMOVAL PARTS Install the removal parts in reverse order of removal proce-
dure.
±
AIR CONDITIONING SYSTEM CondenserAC±121
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EVAPORATOR
REMOVAL OF EVAPORATOR
1. DISCONNECT NEGATIVE (±) CABLE FROM BATTERY
2. RECOVER REFRIGERANT IN REFRIGERATION SYSTEMSee page AC±16
3. REMOVE ABS ACTUATOR
See page BR±48
4. REMOVE LIQUID TUBE AND SUCTION TUBE Remove two bolts and both tubes.
5. REMOVE EQUALIZER TUBE FROM EPR
Remove the bole and the tube.
NOTICE: Cap the open fittings immediately to keep mois-
ture out of the system.
6. REMOVE UNDER COVER GLOVE BOX AND SIDE AIR DUCT
7. DISCONNECT CONNECTORS AND REMOVE POWER STEERING RELAY BOX COOLING FAN COMPUTER AND
TRC COMPUTER
AC±122
±
AIR CONDITIONING SYSTEM Evaporator
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8. PULL FLOOR CARPET DOWN AND REMOVECOMPUTER COVER
9. REMOVE EVAPORATOR COVER AND FOOT AIR DUCT BOLT
10. REMOVE EVAPORATOR (a) Remove six bolts and down the lower case.
(b) Pull and remove the evaporator.
(c) Pull out the evaporator sensor from the evaporator fins.
(d) Remove two bolts using a hexagon wrench and separate the evaporator and expansion valve.
INSPECTION OF EVAPORATOR
1. INSPECT FINS FOR BLOCKAGE
If the fins are clogged, clean them with compressed air.
NOTICE: Never use water to clean the evaporator.
2. INSPECT FITTINGS FOR CRACKS OR SCRATCHES Repair as necessary.
±
AIR CONDITIONING SYSTEM EvaporatorAC±123
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INSTALLATION OF EVAPORATOR
1. INSTALL REMOVAL PARTSInstall the removal parts in reverse order of removal proce-
dure.
HINT:
wThe tightening torque for the bolt used to install the
expansion valve on the evaporator is shown below.
Specified torque: 5.4 N Vm (55 kgf Vcm, 48 ft Vlbf)
w The tightening torque for the bolts used to install the
liquid tube and suction tube to the cooling is shown
below.
Specified torque: 10 N Vm (100 kgf Vcm, 7 ft Vlbf)
w The tightening torque specified for the bolt used to
install the equalizer tube to EPR is shown below.
Specified torque: 25 N Vm (250 kgf Vcm, 18 ft Vlbf)
2. IF EVAPORATOR WAS REPLACED, ADD COMPRESSOR
OIL TO EVAPORATOR
Add 40±50 cc (1.4±1.7 fl.oz)
Compressor oil: ND OIL 6,
SUNISO NO. 5 GS or equivalent
3. EVACUATE AIR IN REFRIGERATION SYSTEM ANDCHARGE WITH REFRIGERANT
Specified amount: 950 + 50 g (33.44 + 1.76 oz)
4. INSPECT FOR LEAKAGE OF REFRIGERANT
Using a gas leak tester, check for leakage of refrigerant.
AC±124
±
AIR CONDITIONING SYSTEM Evaporator
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HEATER RADIATOR
REMOVAL OF HEATER RADIATOR
1. SET TEMPERATURE CONTROL SWITCH TO MAX COOL
2. REMOVE A/C UNITSee page AC±107
3. REMOVE HATER RADIATOR
(a) Remove the two screws and the plate.
(b) Remove the two screws and the clamps.
(c) Pull the radiator out.
INSPECTION OF HEATER RADIATOR
INSPECT FINS FOR BLOCKAGE If the fins are clogged, clean them with compressed air.
INSTALLATION OF HEATER RADIATOR
1. INSTALL HEATER RADIATOR TO A/C UNIT(a) Put the radiator in the A/C until.
(b) Install the clamps with two screws.
(c) Install the plate with two screws.
2. INSTALL A/C UNIT
See page AC±108
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AIR CONDITIONING SYSTEM Heater RadiatorAC±125
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EXPANSION VALVE
ON±VEHICLE INSPECTION
1. CHECK QUANTITY OF GAS DURING REFRIGERATIONCYCLE
2. INSTALL MANIFOLD GAUGE SET
3. RUN ENGINE
Run the engine at 2,000 rpm for at least 5 minutes. Then
check that the high pressure reading is 1,275±1,471 kPa
(13±15 kgf/cm, 185±213 psi).
4. CHECK EXPANSION VALVE If the expansion valve is faulty, the low pressure reading will
drop to 0 kPa (0 kgf/cm, 0 psi), otherwise it is OK.
HINT: When the low pressure drops to 0 kPa (0 kgf/cm, 0 psi),
feel the receiver's IN and OUT sides for no temperature differ-
ence.
REMOVAL OF EXPANSION VALVE
1. REMOVE EVAPORATOR See page AC±124.
2. REMOVE EQUALIZER TUBES
3. REMOVE EXPANSION VALVE
INSTALLATION OF EXPANSION VALVE
1. INSTALL EXPANSION VALVE
Specified torque:
0.31 inch tube 13 N Vm (135 kgf Vcm, 10 ft Vlbf)
0.50 inch tube 22 N Vm (225 kgf Vcm, 16 ft Vlbf)
2. INSTALL EQUALIZER TUBES
3. INSTALL EVAPORATOR
See page AC±124
AC±126
±
AIR CONDITIONING SYSTEM Expansion Valve
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WATER VALVE
REMOVAL OF WATER VALVE
1. DISCONNECT FOLLOWING PARTS FROM WATERVA LV E
wWater hose
w acuum hose
w Connector
2. REMOVE WATER VALVE (a) Remove the two bolts.
(b) Loosen the hose band, then pull off the water hose.
INSPECTION OF WATER VALVE VSV
See page AC±90
±
AIR CONDITIONING SYSTEM Water ValveAC±127
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