LEXUS GS400 2000 Service Owner's Guide

AC0WQ±01
± AIR CONDITIONINGBLOWER UNIT
AC±31
2716 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
DISASSEMBLY
1. REMOVE AIR REFINER FILTER
(a) Release the 4 claws and remove the cover.
(b) Pull out the air refiner filter.
2. REMOVE AIR INLET SERVOMOTOR
Remove the 3 screws and servomotor.
3. REMOVE BLOWER MOTOR
Remove the 3 screws and blower motor.
4. REMOVE BRACKET
Remove the screw and bracket.

AC0WR±01
AC±32
± AIR CONDITIONINGBLOWER UNIT
2717 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
REASSEMBLY
Reassembly is in the reverse order of disassembly (See page AC±26).

AC0WS±01
± AIR CONDITIONINGBLOWER UNIT
AC±33
2718 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSTALLATION
Installation is in the reverse order of removal (See page AC±30).

AC0WT±01
I02373
GS300:
W
1
2
I02374
GS400:
W
1
2
AC±34
± AIR CONDITIONINGCOMPRESSOR AND MAGNETIC CLUTCH
2719 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
COMPRESSOR AND MAGNETIC
CLUTCH
ON±VEHICLE INSPECTION
1. INSPECT COMPRESSOR FOR METALLIC SOUND
Check there is abnormal metallic sound from the compressor
when the A/C switch is ON.
If abnormal metallic sound is heard, replace the compressor as-
sembly.
2. INSPECT REFRIGERANT PRESSURE
(See page AC±3)
3. INSPECT VISUALLY FOR LEAKAGE OF REFRIGER-
ANT
Using a gas leak detector, check for leakage of refrigerant.
If there is any leakage, replace the compressor assembly.
4. INSPECT COMPRESSOR LOCK SENSOR RESIS-
TANCE
(a) Disconnect the connector.
(b) Measure resistance between terminals 1 and 2.
Standard resistance:
570 ± 1,050 W at 20°C (68 °F)
If resistance is not as specified, replace the compressor.

I02376
GS300:
3
I02375
GS400:
3
± AIR CONDITIONINGCOMPRESSOR AND MAGNETIC CLUTCH
AC±35
2720 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
5. MAKE THESE VISUAL CHECKS:
(a) Leakage of grease from the clutch bearing.
(b) Signs of oil on the pressure plate or rotor.
6. INSPECT MAGNETIC CLUTCH BEARING FOR NOISE
(a) Start engine.
(b) Check for abnormal noise from the compressor when the
A/C switch is OFF.
If abnormal noise is being emitted, replace the rotor of magnetic
clutch.
7. INSPECT MAGNETIC CLUTCH OPERATION
(a) Disconnect the connector.
(b) Connect the positive (+) lead from the battery to terminal
3 and the negative (±) lead to the body ground.
(c) Check that the magnetic clutch is energized.
If operation is not as specified, replace the magnetic clutch.

AC0WU±01
I02379
GS300:
PS Pump PS Pump Bracket
52 (530, 38)
Compressor Bracket
52 (530, 38)
58 (590, 43)
Drive Belt
52 (530, 38)
O±Ring
Discharge Hose
10 (100, 7)
Suction Hose
10 (100, 7)

O±Ring
26 (265, 19)
52 (530, 38)
52 (530, 38)
Engine Under Cover
GS400:
Drive Belt
10 (100, 7)
10 (100, 7)Discharge Hose
Suction Hose

O±Ring

O±Ring

O±Ring
10 (100, 7)
49 (500, 36)
29 (300, 22)
Stay
Engine Under Cover
Compressor
N´m (kgf´cm, ft´lbf): Specified torque

Non±reusable part
58 (590, 43)
Compressor
52 (530, 38)
AC±36
± AIR CONDITIONINGCOMPRESSOR AND MAGNETIC CLUTCH
2721 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
COMPONENTS

I05295
Stator
Rotor
Shim Pressure Plate

Snap RingCompressor

Snap Ring
13.2 (135, 9)
N´m (kgf´cm, ft´lbf): Specified torque

Non±reusable part
± AIR CONDITIONINGCOMPRESSOR AND MAGNETIC CLUTCH
AC±37
2722 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)

AC0WV±01
I02381
I02380
I02382
AC±38
± AIR CONDITIONINGCOMPRESSOR AND MAGNETIC CLUTCH
2723 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
REMOVAL
1. RUN ENGINE AT IDLE SPEED WITH A/C ON FOR
APPROX. 10 MINUTES
2. STOP ENGINE
3. DISCONNECT NEGATIVE (±) TERMINAL CABLE
FROM BATTERY
4. DISCHARGE REFRIGERANT FROM REFRIGERATION
SYSTEM
5. REMOVE ENGINE UNDER COVER
6. REMOVE DRIVE BELT
(See page AC±15)
7. GS400:
DISCONNECT DISCHARGE HOSE
Remove the nut and disconnect the discharge hose.
NOTICE:
Cap the open fitting immediately to keep moisture or dirt
out of the system.
8. GS400:
REMOVE SUCTION HOSE
Remove the nut, bolt and suction hose.
NOTICE:
Cap the open fitting immediately to keep moisture or dirt
out of the system.
9. GS300:
DISCONNECT DISCHARGE AND SUCTION HOSES
Remove the 2 nut and disconnect the both hoses.
NOTICE:
Cap the open fitting immediately to keep moisture or dirt
out of the system.

N08002
I02384
I02385
I02386
I02383
± AIR CONDITIONINGCOMPRESSOR AND MAGNETIC CLUTCH
AC±39
2724 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
10. GS300:
REMOVE 2 PS PUMP SET BOLTS
11. GS300:
REMOVE COMPRESSOR
(a) Remove the bolt and PS pump bracket.
(b) Remove the 2 bolts and compressor bracket.
(c) Disconnect the connector.
(d) Remove the nut and 3 bolts.
(e) Using a torx socket (E10), remove the stud bolt and com-
pressor.
12. GS400:
REMOVE COMPRESSOR
(a) Disconnect the connector.
(b) Remove the nut, bolt and compressor stay.
(c) Remove the 2 bolts and compressor.

AC0WW±01
AC0943
SST
AC0944
SST
AC0945
SST
AC0946
Shim
Pressure
Plate
AC0947
SST AC±40
± AIR CONDITIONINGCOMPRESSOR AND MAGNETIC CLUTCH
2725 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
DISASSEMBLY
1. REMOVE PRESSURE PLATE
(a) Using SST and a socket wrench, remove the shaft bolt.
SST 07112±76060
Torque: 13.2 N´m (135 kgf´cm, 9 ft´lbf)
(b) Install SST on the pressure plate.
SST 07112±66040
(c) Using SST and socket wrench, remove the pressure
plate.
SST 07112±66040, 07112±76060
(d) Remove the shims from the pressure plate.
2. REMOVE ROTOR
(a) Using SST, remove the snap ring.
SST 07114±84020