2000 LEXUS GS400 lock

AC0WC±01
I03854
GS300:
Turn
I03855
GS400:
± AIR CONDITIONINGDRIVE BELT
AC±15
2700 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
REMOVAL
1. GS 300:
REMOVE DRIVE BELT
Loosen the drive belt tension by turning the drive belt tensioner
clockwise and remove the drive belt.
2. GS 400:
REMOVE DRIVE BELT
Loosen the drive belt tension by turning the drive belt tensioner
counterclockwise and remove the drive belt.

I02353
GS400:
Low Pressure
Charging HoseHigh Pressure
Charging Hose
I02354
GS300:
Low Pressure
Charging HoseHigh Pressure
Charging HoseAC0WE±01
N04392
Sleeve
± AIR CONDITIONINGMANIFOLD GAUGE SET
AC±17
2702 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
MANIFOLD GAUGE SET
SET ON
1. CONNECT CHARGING HOSES TO MANIFOLD
GAUGE SET
Tighten the nuts by hand.
CAUTION:
Do not connect the wrong hoses.
2. CONNECT QUICK DISCONNECT ADAPTERS TO
CHARGING HOSES
Tighten the nuts by hand.
3. CLOSE BOTH HAND VALVES OF MANIFOLD GAUGE
SET
4. REMOVE CAPS FROM SERVICE VALVE ON REFRIG-
ERANT LINES
5. CONNECT QUICK DISCONNECT ADAPTERS TO SER-
VICE VALVES
HINT:
Push the quick disconnect adapter onto the service valve, then
slide the sleeve of the quick disconnect adapter downward to
lock it.

AC0WF±01
N06553
AC±18
± AIR CONDITIONINGMANIFOLD GAUGE SET
2703 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
SET OFF
1. CLOSE BOTH HAND VALVES OF MANIFOLD GAUGE
SET
2. DISCONNECT QUICK DISCONNECT ADAPTERS
FROM SERVICE VALVES ON REFRIGERANT LINE
HINT:
Slide the sleeve of the quick disconnect adapter upward to un-
lock the adapter and remove it from the service valve.
3. INSTALL CAPS TO SERVICE VALVES ON REFRIGER-
ANT LINES

AC0WI±01
± AIR CONDITIONINGREFRIGERANT LINE
AC±21
2706 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
REPLACEMENT
1. DISCHARGE REFRIGERANT FROM REFRIGERATION SYSTEM
2. REPLACE FAULTY TUBE OR HOSE
NOTICE:
Cap the open fittings immediately to keep moisture or dirt out of the system.
3. TIGHTEN JOINT OF BOLT OR NUT TO SPECIFIED TORQUE
NOTICE:
Connections should not be torqued tighter than the specified torqued.
Part tightenedN´mkgf´cmft´lbf
Compressor x Discharge hose101007
Compressor x Suction hose101007
Condenser x Discharge hose101007
Condenser x Liquid tube101007
A/C unit x Liquid and Suction tubes101007
Expansion valve x Liquid and suction tube4.14236 in.´lbf
Evaporator x Liquid and suction tube4.14236 in.´lbf
Suction line (Block joint)101007
4. EVACUATE AIR FROM REFRIGERATION SYSTEM AND CHARGE SYSTEM WITH REFRIGERANT
Specified amount: 600 ± 50 g (21.16 ± 1.76 oz.)
5. INSPECT FOR LEAKAGE OF REFRIGERANT
Using a gas leak detector, check for leakage of refrigerant.
6. INSPECT AIR CONDITIONING OPERATION

I01387
Condition : Periodically cools and then fails to cool
I01388
Condition: Insufficient cooling
± AIR CONDITIONINGAIR CONDITIONING SYSTEM
AC±5
2690 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(2) Moisture present in refrigeration system.
Symptom seen in
refrigeration systemProbable causeDiagnosisRemedy
During operation, pressure on low
pressure side sometimes become
a vacuum and sometime normal
Moisture entered in refrigeration
system freezes at expansion valve
orifice and temporarily stops cycle,
but normal state is restored after a
time when the ice melts
Dryer in oversaturated state

Moisture in refrigeration system
freezes at expansion valve orifice
and blocks circulation of refriger-
ant(1) Replace dryer
(2) Remove moisture in cycle
through repeatedly evacuating air
(3) Charge proper amount of new
refrigerant
(3) Insufficient cooling
Symptom seen in
refrigeration systemProbable causeDiagnosisRemedy

Pressure low on both low and
high pressure sides

Bubbles seen in sight glass con-
tinuously

Insufficient cooling performance
Gas leakage at some place in re-
frigeration system
Insufficient refrigerant in system

Refrigerant leaking
(1) Check for gas leakage with gas
leak detector and repair if neces-
sary
(2) Charge proper amount of re-
frigerant
(3) If indicated pressure value is
near 0 when connected to gauge,
create the vacuum after inspecting
and repairing the location of the
leak

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.

AC0WZ±01
AC±46
± AIR CONDITIONINGCONDENSER
2731 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
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 pliers.
2. INSPECT CONDENSER AND FITTINGS FOR LEAKAGE OF REFRIGERANT
Using a gas leak detector, check for leakage of refrigerant.
If there is leakage, check the tightening torque at the joints.

AC0X3±01
± AIR CONDITIONINGEVAPORATOR
AC±53
2738 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSPECTION
1. CHECK EVAPORATOR FINS FOR BLOCKAGE
If the fins are clogged, clean them with compressed air.
NOTICE:
Never use water to clean the evaporator.
2. CHECK FITTING FOR CRACKS OR SCRATCHES
If necessary, repair or replace.