LEXUS GS400 2000 Service Workshop Manual

AC0X2±01
I02400
I02401
SST
± AIR CONDITIONINGEVAPORATOR
AC±51
2736 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
EVAPORATOR
REMOVAL
1. REMOVE A/C UNIT
(See page AC±24)
2. REMOVE HEATER RADIATOR
(See page AC±55)
3. REMOVE AIR MIX SERVOMOTOR PASSENGER SIDE
(a) Disconnect the connector.
(b) Remove the 3 screws and servomotor.
4. REMOVE TUBE AND ACCESSORY
(a) Pry out packing.
HINT:
At the time of installation, please refer to the following item.
Do not reuse the packing.
(b) Using SST, remove the 2 bolts and the tube and accesso-
ry.
SST 07110±61050
Torque: 4.1 N´m (42 kgf´cm, 36 in.´lbf)
NOTICE:
Cap the open fittings immediately to keep moisture or dirt
out of the system.
HINT:
At the time of installation, please refer to the following item.
Lubricate 2 new O±rings with compressor oil and install them
to the tube.
(c) Remove screw and drain pipe.

I02402
AC±52
± AIR CONDITIONINGEVAPORATOR
2737 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
5. REMOVE EVAPORATOR
(a) Disconnect the connector from blower motor control
relay.
(b) Remove the screw and drain hose.
(c) Remove the 4 screws and cover.
(d) Pull out the evaporator.
HINT:
At the time of installation, please refer to the following item.
If evaporator is replaced, add compressor oil to evaporator.
Add 40 cc (1.4 fl. oz.)
Compressor oil: ND±OIL 8 or equivalent

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.

AC0X4±01
AC±54
± AIR CONDITIONINGEVAPORATOR
2739 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSTALLATION
Installation is in the reverse order of removal (See page AC±51).

AC0X5±01
I02403
± AIR CONDITIONINGHEATER RADIATOR
AC±55
2740 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
HEATER RADIATOR
REMOVAL
1. REMOVE A/C UNIT (See page AC±24)
2. REMOVE HEATER RADIATOR
(a) Remove the screw and clamp.
(b) Pull out the heater radiator.

AC0X6±01
AC±56
± AIR CONDITIONINGHEATER RADIATOR
2741 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSPECTION
INSPECT FINS FOR BLOCKAGE
If the fins are clogged, clean them with compressed air.

AC0X7±01
± AIR CONDITIONINGHEATER RADIATOR
AC±57
2742 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSTALLATION
Installation is in the reverse order of removal (See page AC±55).

AC0X8±01
AC±58
± AIR CONDITIONINGEXPANSION VALVE
2743 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
EXPANSION VALVE
ON±VEHICLE INSPECTION
1. CHECK QUANTITY OF GAS DURING REFRIGERATION CYCLE
2. SET ON MANIFOLD GAUGE SET
(See page AC±17)
3. RUN ENGINE
Run the engine at 1,500 rpm for at least 5 minutes.
Then check that the high pressure reading is 1.37 ± 1.57 MPa (14 ± 16 kgf/cm
2, 199 ±228 psi).
4. CHECK EXPANSION VALVE
If the expansion valve is faulty, the low pressure reading will drop to 0 kPa (0 kgf/cm
2, 0 psi).

AC0X9±01
I02404
± AIR CONDITIONINGEXPANSION VALVE
AC±59
2744 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
REMOVAL
1. DISCHARGE REFRIGERANT FROM REFRIGERATION
SYSTEM
HINT:
At the time of installation, please refer to the following item.
Evacuate air from refrigeration system.
Charge system with refrigerant and inspect for leakage of refrig-
erant.
Specified amount: 600 ± 50 g (21.16 ± 1.76 oz.)
2. REMOVE INSTRUMENT PANEL
(See page BO±91)
3. REMOVE EXPANSION VALVE
(a) Pry out the packings.
HINT:
At the in time of installation, please refer to the following item.
Do not reuse the packing.
(b) Using SST, remove the 4 bolts and separate the expan-
sion valve and tube and accessory.
SST 07110±61050
Torque: 4.1 N´m (42 kgf´cm, 36 in.´lbf)
NOTICE:
Cap the open fittings immediately to keep moisture or dirt
out of the system.
HINT:
At the in time of installation, please refer to the following item.
Lubricate 6 new O±rings with compressor oil and install them
to the tube and valve.

AC0XA±01
AC±60
± AIR CONDITIONINGEXPANSION VALVE
2745 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSTALLATION
Installation is in the reverse order of removal (See page AC±59).