Thermostat Repair Procedures

Removal and Installation

1. 1
   Remove the engine compartment lower front cover. (Refer to Engine and Transaxle Assembly - "Engine Compartment Lower Cover")
2. 2
   Drain the coolant. (Refer to Cooling System - "Cooling".)
3. 3
   Disconnect the radiator lower hose (A).

   

4. 4
   Install the water inlet pipe (A).

   Tightening torque: 18.6~24 N·m

   

5. 5
   Remove the thermostat (A).

   

6. 6
   To install, perform the removal procedure in reverse order.
7. 7
   Remove the thermostat.
8. 8
   Remove the drive belt. (Refer to Valve Timing System - "Drive Belt")
9. 9
   Remove the intake manifold. (Refer to Exhaust and Intake System - "Intake Manifold")
10. 10
    Remove the alternator (Refer to Engine Electrical System - "Alternator").
11. 11
    Disconnect the water pipe (A), then remove the mounting bolt from the water pipe (B).

    Tightening torque: 9.8–11.8 N·m

    

12. 12
    Remove the bolt (A) and nut (B) securing the heater pipe.

    Torque: 19.6 ~ 26 N·m

    

13. 13
    Remove the thermostat housing (A), then remove the heater pipe (B).

    Tightening torque: 18.6~24 N·m

    

14. 14
    To install, perform the removal procedure in reverse order.
15. 15
    Fill the radiator with coolant. (Refer to Cooling System - "Cooling".)
16. 16
    Start the engine and check for leaks.

Inspection

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

   

2. 2
   Check the valve opening temperature. Valve opening temperature: 86.5 ~ 90 °C Full open temperature: 100 °C
3. 3
   Check the valve lift.

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