cooling LEXUS GS400 2000 Service Owner's Guide

B01860
SST
B01871
Tank
Lock
Plate
O±Ring
CO±22
± COOLING (2JZ±GE)RADIATOR
1560 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(b) Install the drain plug.
8. INSTALL RADIATOR CAP
9. INSPECT FOR WATER LEAKS
(a) Tighten the drain plug.
(b) Plug the inlet pipes of the radiator with SST.
SST 09230±01010
(c) Using a radiator cap tester, apply pressure to the radiator.
Test pressure: 177 kPa (1.8 kgf/cm
2, 26 psi)
(d) Submerge the radiator in water.
(e) Inspect for leaks.
HINT:
On radiators with resin tanks, there is a clearance between the
tank and lock plate where a minute amount of air will remain,
giving the appearance of an air leak when the radiator is sub-
merged in water. Therefore, before doing the water leak test,
first swish the radiator around in the water until all air bubbles
disappear.
10. INSTALL NEW PACKINGS

CO0AC±01
B01881
± COOLING (2JZ±GE)RADIATOR
CO±23
1561 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSTALLATION
1. INSTALL ELECTRIC COOLING FAN TO RADIATOR
(a) Install the electric cooling fan with the 6 bolts.
Torque: 5.0 N´m (50 kgf´cm, 44 in.´lbf)
(b) Connect the radiator reservoir hose to the radiator.
2. INSTALL RADIATOR AND ELECTRIC COOLING FAN
ASSEMBLY
(a) Install the 2 lower radiator supports to the radiator.
(b) Attach the 2 lower radiator supports on the radiator to the
body bracket.
(c) Install the radiator and electric cooling fan assembly with
the 2 upper radiator supports and 2 nuts.
Torque: 13.5 N´m (135 kgf´cm, 10 ft´lbf)
(d) Connect these parts:

Upper radiator hose to radiator

Lower radiator hose to radiator

ECM outlet duct to ECM box

Wire for electric cooling fan to clamp on electric
cooling fan

2 electric cooling fan connectors

ECT switch connector for electric cooling fan

2 oil cooler hoses for A/T to radiator
3. INSTALL AIR CLEANER AND MAF METER AS-
SEMBLY
4. INSTALL AIR CLEANER INLET
5. FILL WITH ENGINE COOLANT
6. START ENGINE AND CHECK FOR ENGINE COOLANT
AND A/T FLUID LEAKS
7. INSTALL ENGINE UNDER COVER

B01900
CO0AD±03
B00922
ECT
Switch
Connector
B02072
B02073
Ammeter
Battery(+)
(±)
CO±24
± COOLING (2JZ±GE)ELECTRIC COOLING FAN
1562 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
ELECTRIC COOLING FAN
ON±VEHICLE INSPECTION
1. CHECK COOLING FAN OPERATION WITH LOW
TEMPERATURE (Below 83°C (181°F))
(a) Turn the ignition switch ON.
(b) Check that the cooling fan stops.
If not, check the cooling fan relay and ECT switch, and check
for a separated connector or severed wire between the cooling
fan relay and ECT switch.
(c) Disconnect the ECT switch connector.
(d) Check that the cooling fan rotates.
If not, check the fuses, radiator fan main relay, cooling fan relay,
cooling fan, and check for a short circuit between the cooling
fan relay and ECT switch.
(e) Reconnect the ECT switch connector.
2. CHECK COOLING FAN OPERATION WITH HIGH
TEMPERATURE (Above 93°C (199°F))
(a) Start the engine, and raise coolant temperature to above
93°C (199°F).
HINT:
Coolant temperature is the detected value by the ECT switch
on the radiator lower tank.
(b) Check that the cooling fan rotates.
If not, replace the ECT switch.
3. INSPECT COOLING FANS
(a) Disconnect the cooling fan connector.
(b) Connect battery and ammeter to the cooling fan connec-
tor.
(c) Check that the cooling fan rotates smoothly, and check
the reading on the ammeter.
Standard amperage: 8.5 ± 11.5 A at 20°C (68°F)
(d) Reconnect the cooling fan connector.

CO0AE±01
B02030
Electric Cooling
Fan Connector Upper Radiator Hose Air Cleaner Inlet
MAF Meter Connector Air Cleaner and MAF Meter Assembly
Intake Air ResonatorElectric Cooling Fan Assembly
Radiator Reservoir Hose
Wire Clamp ECM Outlet Duct
x 6
EVAP Hose
Engine
Wire Clamp
± COOLING (2JZ±GE)ELECTRIC COOLING FAN
CO±25
1563 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
COMPONENTS

B00918
No.2 Fan Motor
Connector
Holder
Fan Shroud
Assembly
No.1 Fan
No.1 Fan Motor
No.2 Fan
CO±26
± COOLING (2JZ±GE)ELECTRIC COOLING FAN
1564 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)

CO0AF±03
B02071
± COOLING (2JZ±GE)ELECTRIC COOLING FAN
CO±27
1565 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
REMOVAL
1. DRAIN ENGINE COOLANT
2. REMOVE AIR CLEANER INLET
3. REMOVE AIR CLEANER AND MAF METER AS-
SEMBLY
4. REMOVE ELECTRIC COOLING FAN
(a) Disconnect the upper radiator hose from the radiator.
(b) Disconnect the ECM outlet duct from the ECM box.
(c) Disconnect the wire for electric cooling fan from the clamp
on the electric cooling fan.
(d) Disconnect the 2 electric cooling fan connector.
(e) Disconnect the radiator reservoir hose from the radiator.
(f) Remove the 6 bolts and electric cooling fan.

CO0AG±01
B00919
B00921
CO±28
± COOLING (2JZ±GE)ELECTRIC COOLING FAN
1566 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
DISASSEMBLY
1. REMOVE FANS
Remove the nut and fan. Remove the 2 fans.
2. REMOVE FAN MOTORS
(a) Disconnect the wires and connector holders from the fan
shroud.
(b) Remove the 3 screws and fan motor. Remove the 2 fan
motors.

CO0AH±01
B00921
B00920
B00919
± COOLING (2JZ±GE)ELECTRIC COOLING FAN
CO±29
1567 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
REASSEMBLY
1. INSTALL FAN MOTORS
(a) Install the fan motor with the 3 screws. Install the 2 fan mo-
tors.
(b) Install the wires and connector holders to the fan shroud
as shown in the illustration.
2. INSTALL FANS
Install the fan with the nut. Install the 2 fans.

CO09Y±01
A02724
Air Cleaner Inlet
Upper Radiator Support
MAF Meter Connector Air Cleaner and MAF
Meter AssemblyLower Radiator Hose
Radiator
Assembly
ECM Outlet Duct
ECT
Switch
Engine Wire Clamp EVAP Hose
Lower Radiator Support
Intake Air Resonator
PS Pump
Front Bracket
Water Pump Pulley
Drive Belt
Engine Under CoverPS Vane Pump
Oil Cooler Hose
for A/T Electric Cooling
Fan Connector
Upper Radiator
Hose
x 18
58 (590, 43)
52 (530, 38)
N´m (kgf´cm, ft´lbf)
 Non±reusable part: Specified torqueWire Clamp
Upper Radiator
Support
± COOLING (2JZ±GE)WATER PUMP
CO±3
1541 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
WATER PUMP
COMPONENTS

B01985
Water Bypass Outlet
 O±Ring
Engine Wire
Water
Pump
Connector Bracket
Idler PulleyGasket
Timing Belt GuideNo.2 Water Bypass Pipe
Drain Hose
Timing Belt Tensioner
Timing Belt
Drive Belt TensionerOil Filler Cap
No.3 Timing Belt Cover
No.1 Water
Bypass Pipe
 Gasket
Crankshaft PulleyDust Boot
x 5 Thermostat
 O±Ring
 O±Ring
No.2 Timing Belt Cover
Gasket
No.1 Timing Belt Cover
 Gasket
Water Inlet
x 6
35 (350, 26)
21 (210, 15)
21 (210, 15)
27 (270, 20)

N´m (kgf´cm, ft´lbf) : Specified torque
 Non±reusable part

Precoated part
330 (3,300, 243)
Clamp Bracket
Crankshaft Position
Sensor Connector
Gasket
CO±4
± COOLING (2JZ±GE)WATER PUMP
1542 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)