Inspect Thermostat


The thermostat is numbered with the valve opening temperature.

2006 ENGINE Cooling - Sequoia

Thermostat Opening Temperature
Fig. 16: Identifying Temperature Mark On Thermostat Assembly 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.

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