Inspection After Removal

• Place a string so that it is caught in the valve of the thermostat (or water control valve) and suspend it in boiling water. It must be fully immersed in the water.
• The valve opening temperature is the temperature at which the valve plate begins to rise from the top plate causing the thermostat to fall off of the string.
• Continue heating the water and thermostat to check valve lift (the full-open valve lift distance).
  NOTE: The valve lift standard temperature for the thermostat (or water control valve) is the reference value.
• After checking the valve lift, lower the water temperature and check the valve closing temperature.
  Fig 1: Inspecting Thermostat

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

Standard Values 

Fig 2: Thermostat Standard Values

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