2003 LEXUS LS430 coolant

ON-VEHICLE INSPECTION
1.CHECK COOLING FAN SYSTEM
a. Look at the chart below. Check that when the cooling fan is in the condition on the left, its
operation is what is written on the right.
Standard when engine coolant temperature is below 82°C (180°F):
CONDITION AND OPERATION SPECIFICATION
If the fan does not operate as specified, proceed to next step.
2.INSPECT COOLING FAN MOTOR
a. Remove the air cleaner inlet No. 1.
b. Disconnect the 2 connectors.
c. Connect the battery and ammeter.
d. Check that the fan rotates smoothly, and then check the amperage on the ammeter.
Standard: 9.2 to 11.0 A at 20° C (68° F)
If the result is not as specified, replace the fan motor.
If the fan operates, proceed to the next step.
ConditionOperation (Fan Speed)
Ignition ON at engine stoppingNot rotating
A/C switch OFF at idle speedNot rotating
A/C switch ON at idle speedRotating (Low speed)
Disconnect ECT sensor connector at idle speedRotating (High speed)

Fig. 11: Measuring resistance of switch
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REPLACEMENT
1.REMOVE V-BANK COVER
2.REMOVE AIR CLEANER INLET NO.1 (See REPLACEMENT
)
3.DRAIN ENGINE COOLANT
a. Remove the 2 radiator caps from the radiator reservoir and radiator.
b. Loosen the radiator drain plug and 2 drain cock plugs, then drain the coolant.

c. Close the radiator drain plug.
d. Tighten the 2 drain cock plugs.
Torque: 13 Nm (130 kgf cm, 9 ft lbf)
Fig. 12: Loosening Radiator Drain Plug And Drain Cock Plugs

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
4.ADD ENGINE COOLANT
a. Slowly fill the cooling system with coolant.
Capacity: 9.5 liters (10.0 US qts, 8.4 lmp. qts)
HINT:
Use of improper coolants may damage the engine cooling system.
Use "TOYOTA Super Long Life Coolant" or similar high quality ethylene glycol based non-
silicate, non-amine, non-nitrite, and non-borate coolant with long-life hybrid organic acid
technology.
New Toyota vehicles are filled with TOYOTA Super Long Life Coolant (color is pink,
premixed ethylene-glycol concentration is approximately 50 % and freezing temperature is -
35° C (-31° F)). When replacing coolant, TOYOTA Super Long Life Coolant is

recommended.
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55004800560056004c0051004a00030057004b00480003004c[nlet and outlet radiator hoses
several times by hand. If the coolant level drops, add coolant.
Fig. 13: Adding Engine Coolant

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
b. Slowly pour coolant into the radiator reservoir until it reaches the FULL line.
c. Install the radiator caps to the radiator and radiator reservoir.
d. Bleed the cooling system.
Start the engine, and open the heater water valve.
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e. Stop the engine, and wait until the engine coolant cools down.
f. Add coolant to the FULL line for the radiator and reservoir.

Fig. 14: Adding Coolant To Full Line For Radiator And Reservoir
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
5.CHECK FOR ENGINE COOLANT LEAKS
6.INSTALL AIR CLEANER INLET NO.1 (See REPLACEMENT
)
7.INSTALL V-BANK COVER
COMPONENTS

1.DISCONNECT BATTERY NEGATIVE TERMINAL
2.DRAIN ENGINE COOLANT (See REPLACEMENT
)
3.REMOVE ENGINE UNDER COVER NO.1
4.REMOVE RADIATOR ASSY
5.REMOVE TIMING BELT (See REPLACEMENT
)
6.REMOVE WATER INLET HOUSING
a. Disconnect the water hose and remove the 2 bolts, inlet housing and O-ring.
Fig. 18: Disconnecting Water Hose

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7.REMOVE TIMING BELT IDLER SUB-ASSY NO.2 (See OVERHAUL
)
8.REMOVE WATER PUMP ASSY
a. Remove the 5 bolts, water pump and
gasket.

Fig. 21: Installing Water Inlet Housing With Bolts
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11.INSTALL TIMING BELT IDLER SUB-ASSY NO.2 (See OVERHAUL
)
12.INSTALL TIMING BELT (See REPLACEMENT
)
13.INSTALL RADIATOR ASSY (See REPLACEMENT
)
14.REFILL ENGINE COOLANT (See REPLACEMENT
)
15.CONNECT BATTERY NEGATIVE TERMINAL
16.CHECK FOR ENGINE COOLANT LEAKS (See ON
-VEHICLE INSPECTION )
17.INSTALL ENGINE UNDER COVER NO.1
INSPECTION
1.INSPECT WATER PUMP ASSY
a. Visuall
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4e0044[ge.

If leakage is found, replace the water pump and timing belt.
b. Turn the pulley, and check that the water pump bearing moves smoothly and quietly.
If it moves roughly or noisily, replace the water pump.
Fig. 22: Inspecting Water Pump Assy

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REPLACEMENT
1.REMOVE AIR CLEANER INLET NO.1 (See REPLACEMENT
)
2.DRAIN ENGINE COOLANT (See REPLACEMENT
)
3.REMOVE THERMOSTAT
a. Remove the 3 nuts and disconnect the water inlet from the water inlet housing.
b. Remove the thermostat.
c. Remove the
gasket from the thermostat.