2003 LEXUS LS430 Factory Repair Manual

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Page 1849 of 4500

LEXUS LS430 2003 Factory Repair Manual ON-VEHICLE INSPECTION 1.CHECK COOLING SYSTEM FOR LEAKS a. Fill the radiator with coolant and attach a radiator cap tester. Fig. 1: Checking Cooling System For Leaks Courtesy of TOYOTA MOTOR SALES

Page 1850 of 4500

LEXUS LS430 2003 Factory Repair Manual psi), and check that the pressure does not drop. If the pressure drops, check the hoses, radiator and water pump for leaks. If no external leaks are found, check the heater core, cylinder block and

Page 1851 of 4500

LEXUS LS430 2003 Factory Repair Manual Fig. 2: Inspecting Thermostat Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. a. Immerse the thermostat in water and gradually heat the water. b. Check the valve opening temperature. Valve opening t

Page 1852 of 4500

LEXUS LS430 2003 Factory Repair Manual

Page 1853 of 4500

LEXUS LS430 2003 Factory Repair Manual Fig. 3: Checking Valve Opening Temperature Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. c. Check the valve lift. Valve lift: 10 mm (0.39 in.) or more at 95°C (203°F) If the valve lift is not as

Page 1854 of 4500

LEXUS LS430 2003 Factory Repair Manual Fig. 4: Checking Valve Lift Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. 2.INSPECT RADIATOR CAP SUB-ASSY

Page 1855 of 4500

LEXUS LS430 2003 Factory Repair Manual a. Using a radiator cap tester, slowly pump the tester and check that air is being released from the vacuum valve. Fig. 5: Measuring Relief Valve Opening Pressure Courtesy of TOYOTA MOTOR SALES, U

Page 1856 of 4500

LEXUS LS430 2003 Factory Repair Manual 93 to 123 kPa (0.95 to 1.25 kgf/cm2 , 13.5 to 17.8 psi) Minimum opening pressure: 78 kPa (0.78 kgf/cm 2 , 11.4 psi) HINT: Pay attention to the tester's maximum reading of the opening pressur
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