Thermostat Repair Procedures

Removal and Installation

Disassembling the thermostat may have adverse effects, reducing cooling efficiency. Do not remove the thermostat, even if the engine tends to overheat.

1. 1
   Drain the engine coolant so that the level is below the thermostat.
2. 2
   Disconnect the radiator lower hose (A).

   

3. 3
   Remove the water inlet connection (A) and the thermostat (B).

   Tightening torque: 18.6 ~ 24 N·m

   

4. 4
   Installation is the reverse of removal.

   Install the thermostat with the jiggle valve facing up. When assembling the thermostat, place the thermostat on the housing with the thermostat projection aligned with the groove in the housing, then install the water inlet pipe. Be careful that the thermostat does not come out of the groove in the housing. Clean the contact surface of the rubber seal.

5. 5
   Fill the engine coolant.
6. 6
   Start the engine and check for leaks.
7. 7
   Recheck the coolant level.

Inspection

1. 1
   Immerse the thermostat in water and gradually heat the water.

   

2. 2
   Check the valve opening temperature. If the valve opening temperature is not as specified, replace the thermostat. Valve opening temperature: 88 ± 1.5 °C Fully open temperature: 100°C (212°F)
3. 3
   Check the valve lift. If the valve lift does not meet the specification, replace the thermostat.

   Valve lift: 8 mm (0.3 in) or more at 100 °C