Thermostat Inspection

Engine. Lexus Is250, Is220D. Gse20 Ale20
4Gr-Fse Cooling. Lexus Is250, Is220D. Gse20 Ale20

  1. INSPECT WATER INLET WITH THERMOSTAT SUB-ASSEMBLY

Thermostat -- Inspection



1. INSPECT WATER INLET WITH THERMOSTAT SUB-ASSEMBLY


    Lexus Is250, Is220D. Gse20 Ale20

  1. The valve opening temperature is marked on the water inlet sub-assembly.



    Lexus Is250, Is220D. Gse20 Ale20

  1. Submerge the water inlet with thermostat sub-assembly, and then gradually heat the water.

  1. Check the valve opening temperature.

    Valve opening temperature:
    80 to 84°C (176 to 183°F)
    HINT:
    The valve opening temperature is stamped on the water inlet with thermostat.


    Lexus Is250, Is220D. Gse20 Ale20.4Gr-Fse Cooling.Cooling System.Thermostat Inspection

  1. Check the valve lift.

    Valve lift:
    8.0 mm (0.315 in.) or more at 95°C (203°F)
    HINT:
    If the valve lift value is not as specified, replace the water inlet with thermostat sub-assembly.

  1. When the temperature of the water inlet with thermostat sub-assembly drops below 77°C, check that the valve is fully closed.

    HINT:
    If the valve is not fully closed, replace the water inlet with thermostat sub-assembly.