2000 LEXUS GS400 clutch

AC0WA±01
I03811
Smog Ventilation
Sensor
No. 2 Cooling Fan Relay
(Marking: FAN NO.2) No. 3 Cooling Fan Relay
(Marking: FAN NO.3)
CompressorMagnetic Clutch Relay
(Marking A/C COMP)
Condenser
Ambient Temperature Sensor Condenser Fan
Engine Coolant Temperature
(ECT) Switch
Air Inlet Servomotor
Blower Motor
Air Outlet Servomotor A/C Amplifier
EvaporatorSolar Sensor A/C Control Assembly
Electrical Multi Vision
(Built in A/C Control Assembly)
Expansion Valve
Air Refiner Filter
Blower Motor Control
Relay Evaporator Temperature
Sensor
Heater Radiator
Air Mix Servomotor
(Driver Side) Air Mix Servomotor
(Passenger Side)Room Temperature
Sensor
± AIR CONDITIONINGAIR CONDITIONING SYSTEM
AC±13
2698 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
LOCATION

± AIR CONDITIONINGAIR CONDITIONING SYSTEM
AC±9
2694 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
3. INSPECT IDLE±UP SPEED
(a) Warm up engine
(b) Inspect idle±up speed when the these conditions are es-
tablished.
Test conditions:

Blower speed control switch at ºHIº position

Temperature control dial at ºCOOLº position

A/C switch ON

Put gear shift in neutral
GS300:
Magnetic clutch conditionIdle±up speed
Magnetic clutch not engaged700 ± 50 rpm
Magnetic clutch engaged800 ± 50 rpm
If idle speed is not as specified, check the idle control system.
GS400:
Magnetic clutch conditionIdle±up speed
Magnetic clutch not engaged750 ± 50 rpm
Magnetic clutch engaged800 ± 50 rpm
If idle speed is not as specified, check the idle control system.
4. INSPECT FOR LEAKAGE OF REFRIGERANT
(a) Perform in these conditions.

Stop engine

Secure good ventilation (If the gas leak detector
may not react volatile gases which are not refriger-
ant, such as evaporated gasoline and exhaust gas)

Repeat the test 2 or 3 times

Make sure that there is some refrigerant remaining
in the refrigeration system.
When compressor is OFF: approx. 392 ± 588 kPa
(4 ± 6 kgf´cm
2, 57 ± 85 psi)
(b) Bring the gas leak detector close to the drain hose before
performing the test.
HINT:

After the blower motor has stopped, leave the cooling for
more than 15 minutes.

Expose the gas leak detector sensor under the drain
hose.

When bring the gas leak detector close to the drain hose,
make sure that the gas leak detector does not react to the
volatile gases.
If such reaction is unavoidable, the vehicle must be lifted up.
(c) If gas leak is not detected on the drain hose, remove the
blower resistor from the cooling unit. Then insert the gas
leak detector sensor into the unit and perform the test.
(d) Disconnect the connector and leave the pressure switch
for approx. 20 minutes. Then bring the gas leak detector
close to the pressure switch and perform the test.
(e) Bring the gas leak detector close to the refrigerant lines.

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.