LEXUS LS430 2003 Factory Repair Manual

Fig. 10: Measuring Resistance Relay
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
2.INSPECT ECT SWITCH
a. Measure the resistance of the switch.
STANDARD SPECIFICATION
If the result is not as specified, replace the switch.
TemperatureSpecified Condition
Above 98° C (208° F)Below 1 Q
Below 88° C (190° F)10 kQ or higher

Fig. 11: Measuring resistance of switch
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
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

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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.
<003200450056004800550059004800030057004b00480003004600520052004f0044005100570003004f004800590048004f0003004c00510056004c0047004800030057004b00480003005500440047004c004400570052005500030045005c0003005300
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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470003005a00440055005000030058005300030057004b0048[ engine.
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

Fig. 15: Identifying Water Pump Component Assy (1 Of 2)
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Fig. 16: Identifying Water Pump Component Assy (2 Of 2)
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Fig. 17: Identifying Water Pump Component Assy (3 Of 2)
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REPLACEMENT

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. 19: Removing Bolts, Water Pump And Gasket
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9.INSTALL WATER PUMP ASSY
a. Install a new gasket and the water pump with the 5 bolts, 2 stud bolts and nut.
Torque:
21 N m (215 kgf cm, 15 ft lbf) for bolt
18 N m (185 kgf cm, 13 ft lbf) for stud bolt
HINT:
Use a bolt this is 30 mm (1.18 in.) in length.