Thermostat Inspection

Reference: THERMOSTAT REMOVAL AND INSTALLATION 

• Check that air bleed valve (1) of thermostat is clean.
• Check that valve seat (2) is free from foreign matters which would prevent valve from seating tight.
  Fig 1: Identifying Air Bleed Valve And Valve Seat

  Courtesy of SUZUKI OF AMERICA CORP.
• Check that wax pellet moves as follows:
  1. Immerse thermostat (1) in water, and heat water gradually.
  2. Check that valve starts opening at specific temperature.

     Temperature at which valve begins to open 

     80 - 84 °C (176 - 183 °F) 

     Temperature at which valve become fully open 

     95 °C (203 °F) 

     Thermostat valve lift 

     More than 8 mm (0.3 in) at 95 °C (203 °F) 

If thermostat does not open as specified above, or sticks in any position, replace it. Such a unit, if reused, will bring about overcooling or overheating tendency.

Fig 2: Checking Thermostat Temperature

Courtesy of SUZUKI OF AMERICA CORP.