6. Check Thermostat

1. Check valve seating condition at normal room temperatures.

   It should seat tightly. 

2. Check valve opening temperature and valve lift.
   1. Valve opening temperature: 82°C (180°F) [standard] 
   2. Valve lift: More than 8.6 mm/95°C (0.339 in/203°F) 
3. Check if valve is closed at 5°C (9°F) below valve opening temperature.

   For details, refer to THERMOSTAT AND THERMOSTAT HOUSING .

   Fig 1: Testing Thermostat

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

OK or NG 

1. OK: GO TO 7.
2. NG: Replace thermostat