Lexus SC300 / Lexus SC400. Manual — part 44
WATER TEMPERATURE SENSOR
REMOVAL OF WATER TEMPERATURE
SENSOR
1.
REMOVE A/C UNIT
See page
2. REMOVE
SENSOR
After taking off the clamp, take out the sensor.
INSPECTION OF WATER TEMPERATURE
SENSOR
See page
INSTALLATION OF WATER
TEMPERATURE SENSOR
1.
INSTALL SENSOR TO A/C UNIT
Install the sensor with the clamp.
2.
INSTALL A/C UNIT
See page
PRESSURE SWITCH
INSPECTION OF PRESSURE SWITCH
See page
REMOVAL OF PRESSURE SWITCH
1.
RECOVER REFRIGERANT IN REFRIGERANT SYSTEM
See page
2.
REMOVE PRESSURE SWITCH
(a) Disconnect the connector.
(b) Remove the pressure switch from the liquid tube.
HINT: Lock the switch mount on the tube with an open end
wrench, being careful not to deform the tube, and remove the
switch.
AC–136
–
AIR CONDITIONING SYSTEM
Water Temperature Sensor, Pressure Switch
INSTALLATION OF PRESSURE SWITCH
1.
INSTALL PRESSURE SWITCH
(a) Install the pressure switch to the liquid tube.
Specified torque: 10 N
⋅
m (100 kgf
⋅
cm, 7 ft
⋅
lbf)
HINT: Lock the switch mount on the tube with an open end
wrench, being careful not to deform the tube, and install the
switch.
(b) Connect the connector.
2. EVACUATE
AIR
IN
REFRIGERATION
SYSTEM
AND
CHARGE WITH REFRIGERANT
See page
Specified amount: 950
±
50 g (33.44
±
1.76 oz)
3.
INSPECTION FOR LEAKAGE OF REFRIGERANT
Using a gas lead tester, check for leakage of refrigerant from
the pressure switch mount.
4.
INSPECT A/C OPERATION
POWER TRANSISTOR
REMOVAL OF POWER TRANSISTOR
1.
REMOVE GLOVE BOX
2.
REMOVE POWER TRANSISTOR
(a) Disconnect
connectors.
(b) Remove the two screws and the power transistor.
INSPECTION OF POWER TRANSISTOR
See page
INSTALLATION OF POWER
TRANSISTOR
1.
INSTALL POWER TRANSISTOR
(a) Install power transistor with two screws.
(b) Connect
connectors.
2.
INSTALL GLOVE BOX
See page
–
AIR CONDITIONING SYSTEM
Pressure Switch, Power Transistor
AC–137
INSTALLATION OF PRESSURE SWITCH
1.
INSTALL PRESSURE SWITCH
(a) Install the pressure switch to the liquid tube.
Specified torque: 10 N
⋅
m (100 kgf
⋅
cm, 7 ft
⋅
lbf)
HINT: Lock the switch mount on the tube with an open end
wrench, being careful not to deform the tube, and install the
switch.
(b) Connect the connector.
2. EVACUATE
AIR
IN
REFRIGERATION
SYSTEM
AND
CHARGE WITH REFRIGERANT
See page
Specified amount: 950
±
50 g (33.44
±
1.76 oz)
3.
INSPECTION FOR LEAKAGE OF REFRIGERANT
Using a gas lead tester, check for leakage of refrigerant from
the pressure switch mount.
4.
INSPECT A/C OPERATION
POWER TRANSISTOR
REMOVAL OF POWER TRANSISTOR
1.
REMOVE GLOVE BOX
2.
REMOVE POWER TRANSISTOR
(a) Disconnect
connectors.
(b) Remove the two screws and the power transistor.
INSPECTION OF POWER TRANSISTOR
See page
INSTALLATION OF POWER
TRANSISTOR
1.
INSTALL POWER TRANSISTOR
(a) Install power transistor with two screws.
(b) Connect
connectors.
2.
INSTALL GLOVE BOX
See page
–
AIR CONDITIONING SYSTEM
Pressure Switch, Power Transistor
AC–137
A/C CONTROL ASSEMBLY
(A/C ECU)
REMOVAL OF A/C CONTROL ASSEMBLY
1.
REMOVE RADIO AND A/C CONTROL ASSEMBLY
See page
2.
REMOVE A/C CONTROL ASSEMBLY
Remove four screws and the A/C control assembly.
INSPECTION OF A/C CONTROL
ASSEMBLY
Judge whether the system is satisfactory or not based on the
”Troubleshooting” procedure on page
INSTALLATION OF A/C CONTROL
ASSEMBLY
1.
INSTALL A/C CONTROL ASSEMBLY TO RADIO
Install the A/C control assembly to the radio with four screws.
2.
INSTALL RADIO AND A/C CONTROL ASSEMBLY
See page
AC–138
–
AIR CONDITIONING SYSTEM
A/C Control Assembly (A/C ECU)
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