THERMOSTAT INSPECTION
1. Remove the thermostat.
2. Visually inspect that the valve is not open at normal temperatures.
3. Place the thermostat into a container filled with water.
Warning: The thermostat and water reach high temperatures during the following inspection. Do not touch the thermostat and water directly. Otherwise, it could cause severe burns.
4. Heat water to inspect the following.
Opening valve temperature and lift amount
If there is any malfunction, replace the thermostat.
Temperature at which thermostat starts to open
63.5—66.5 °C {147—151 °F}
Thermostat fully-open temperature: 78°C {172 °F}
Thermostat fully-open lift amount: 4.5 mm {0.18 in} or more

THERMOSTAT REMOVAL/INSTALLATION
Warning:
Never remove the cooling system cap or loosen the radiator drain plug while the engine is running, or when the engine and radiator are hot. Scalding engine coolant and steam may shoot out and cause serious injury. It may also damage the engine and cooling system.
Turn off the engine and wait until it is cool. Even then, be very careful when removing the cap. Wrap a thick cloth around it and slowly turn it counterclockwise to the first stop. Step back while the pressure escapes.
When you are sure all the pressure is gone, press down on the cap using the cloth, turn it, and remove it.
Steps:
1. Disconnect the negative battery terminal.
2. Remove the engine cover.
3. Remove the following parts.
Left wall (rear).
Left wall (front).
Rear wall.
4. Drain the engine coolant.
5. Remove the cooling fan motor.
6. Remove the decoupling ring tensioner.
7. Remove the A/C compressor with the pipes connected and secure the A/C compressor using wire or rope so that it does not interfere with the work.

9. Disconnect terminal B.

13. Remove using the procedure shown in the figure.
14. Install in the reverse order of removal.
15. Add engine coolant.