Inspection After Removal

WARNING: This page is about a different car, the 2005 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.

Place a thread so that it is caught in the valve of the thermostat. Immerse fully in a container filled with water. Heat while stirring.
The valve opening temperature is the temperature at which the valve opens and falls from the thread.
Continue heating. Check the full-open lift amount.

After checking the full-open lift amount, lower the water temperature and check the valve closing temperature.

Fig 1: Inspecting Thermostat Valve

Courtesy of NISSAN MOTOR CO., U.S.A.

Standard values:

THERMOSTAT OPENING AND CLOSING TEMPERATURE SPECIFICATIONS

Condition	Specification
Valve opening temperature	80 - 84°C (176 - 183°F)
Full-open lift amount	More than 10 mm/95°C (0.39 in/203°F)
Valve closing temperature	77°C (171°F) or higher