Thermostat Inspection

Engine. Lexus Gs430, Gs300. Uzs190 Grs190
3Uz-Fe Cooling. Lexus Gs430, Gs300. Uzs190 Grs190

  1. INSPECT THERMOSTAT

Thermostat -- Inspection



1. INSPECT THERMOSTAT


Lexus Gs430, Gs300. Uzs190 Grs190.3Uz-Fe Cooling.Cooling System.Thermostat Inspection
HINT:
The valve opening temperature is inscribed on the thermostat.

  1. Immerse the thermostat in water and then gradually heat the water.



    Lexus Gs430, Gs300. Uzs190 Grs190.3Uz-Fe Cooling.Cooling System.Thermostat Inspection

  1. Check the valve opening temperature of the thermostat.

    Valve opening temperature:
    80 to 84°C (176 to 183°F)
    If the valve opening temperature is not within the specified range, replace the thermostat.


    Lexus Gs430, Gs300. Uzs190 Grs190.3Uz-Fe Cooling.Cooling System.Thermostat Inspection

  1. 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 specified, replace the thermostat.

  1. Check that the valve is fully closed when the thermostat temperature is below 77°C (171°F).
    If not fully closed, replace the thermostat.