LEXUS SC400 1991 Service Repair Manual

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
±
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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INSTALLATION OF WATER VALVE
1. INSTALL WATER VALVE(a) Push the water hose for the heater unit onto the pipe until the pipe's markings are hidden.
(b) Install the hose clip in a position where about 1 mm (0.039 in.) of the marking on the hose can bee seen.
(c) Install the water valve with two screws.
2. INSTALL FOLLOWING PARTS TO WATER VALVE wConnector
w Vacuum hose
w Water hose
HINT:
w Push the water hose onto the water valve pipe until the
pipe is completely hidden.
w Install the hose clip in a position where about 1 mm
(0.039 in.) of the marking on the hose can bee seen.
AC±128
±
AIR CONDITIONING SYSTEM Water Valve
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BLOWER MOTOR
REMOVAL OF BLOWER MOTOR
1. REMOVE GLOVE BOXSee page BO±112
2. REMOVE ECU COVER
(a) Lift up the front end of the carpet on the passenger side.
(b) Remove the two nuts and the cover.
3. REMOVE CONNECTOR BRACKET Remove the two screws and the bracket.
4. REMOVE MOTOR (a) Disconnect the connector.
(b) Remove the three screws and the motor.
INSPECTION OF BLOWER MOTOR
See page AC±81
INSTALLATION OF BLOWER MOTOR
1. INSTALL MOTOR
(a) Install the motor with three screws.
(b) Connect the connector.
2. INSTALL CONNECTOR BRACKET
3. INSTALL ECU COVER
4. INSTALL GLOVE BOX
±
AIR CONDITIONING SYSTEM Blower MotorAC±129
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AIR INLET SERVOMOTOR
REMOVAL OF AIR INLET SERVOMOTOR
1. REMOVE INSTRUMENT PANEL REINFORCEMENTSee page BO±109
2. REMOVE SERVOMOTOR (a) Disconnect the connector.
(b) Disconnect the control link.
(c) Remove the three screws and the servomotor.
INSPECTION OF AIR INLET
SERVOMOTOR
See page AC±64
AIR INLET SERVOMOTOR
INSTALLATION
1. INSTALL SERVOMOTOR
(a) Install the servomotor with three screws.
(b) Connect the control link.
(c) Connect the connector.
2. INSTALL INSTRUMENT PANEL REIFORCEMENT See page BO±109
AC±130
±
AIR CONDITIONING SYSTEM Air Inlet Servomotor
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AIR OUTLET SERVOMOTOR
REMOVAL OF AIR OUTLET
SERVOMOTOR
1. REMOVE INSTRUMENT PANEL REINFORCEMENTSee page BO±109
2. REMOVE SERVOMOTOR
(a) Disconnect the connector.
(b) Remove the four screws and the servomotor.
INSPECTION OF AIR OUTLET
SERVOMOTOR
See page AC±68
INSTALLATION OF AIR OUTLET
SERVOMOTOR
1. INSTALL SERVOMOTOR
(a) Install the servomotor with four screws.
(b) Connect the connector.
2. INSTALL INSTRUMENT PANEL REINFORCEMENT
See page BO±109
AIR MIX SERVOMOTOR
REMOVAL OF AIR MIX SERVOMOTOR
1. REMOVE A/C UNIT
See page AC±107
2. REMOVE SERVOMOTOR
(a) Disconnect the connector.
(b) Remove the three screws and the servomotor.
INSPECTION OF AIR MIX SERVOMOTOR
See page AC±60
INSTALLATION OF AIR MIX
SERVOMOTOR
1. INSTALL SERVOMOTOR
(a) Install the servomotor with three screws.
(b) Connect the connector.
2. INSTALL A/C UNIT
See page AC±108
±
AIR CONDITIONING SYSTEM Air Outlet Servomotor, Air Mix ServomotorAC±131
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BLOWER RESISTOR
REMOVAL OF BLOWER RESISTOR
1. REMOVE GLOVE BOXSee page BO±112
2. REMOVE RESISTOR
(a) Disconnect the connector.
(b) Remove the two screws and the resistor.
INSPECTION OF BLOWER RESISTOR
See page AC±80
INSTALLATION OF BLOWER RESISTOR
1. INSTALL RESISTOR
(a) Install the resistor with two screws.
(b) Connect the connector.
2. INSTALL GLOVE BOX
See page BO±112
ROOM TEMPERATURE SENSOR
REMOVAL OF ROOM TEMPERATURE
SENSOR
1. REMOVE NO. 1 LOWER FINISH PANEL
See page BO±112
2. REMOVE SENSOR Remove the screw and the sensor.
INSPECTION OF ROOM TEMPERATURE
SENSOR
See page AC±44
INSTALLATION OF ROOM
TEMPERATURE SENSOR
1. INSTALL SENSOR
Install the sensor with one screw.
2. INSTALL NO. 1 LOWER FINISH PANEL
See page BO±112
AC±132
±
AIR CONDITIONING SYSTEM Blower Resistor, Room Temperature Sensor
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AMBIENT TEMPERATURE SENSOR
REMOVAL OF AMBIENT TEMPERATURE
SENSOR
1. REMOVE ENGINE UNDER COVER
2. REMOVE SENSOR
(a) Remove the clip and the sensor.
(b) Disconnect the connector.
INSPECTION OF AMBIENT
TEMPERATURE SENSOR
See page AC±46
INSTALLATION OF AMBIENT
TEMPERATURE SENSOR
1. INSTALL SENSOR
(a) Connect the connector.
(b) Install the sensor with the clip.
2. INSTALL ENGINE UNDER COVER
±
AIR CONDITIONING SYSTEM Ambient Temperature SensorAC±133
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