Thermostat: Service and Repair

REMOVAL
1. Lift-up the vehicle.





2. Remove under cover.





3. Drain engine coolant completely.





4. Disconnect radiator outlet hose from thermostat cover.





5. Remove thermostat cover and gasket, and pull out the thermostat.

INSTALLATION
1. Install the thermostat to oil pan upper, and install the thermostat cover together with a gasket.

CAUTION:
^ When reinstalling the thermostat, use a new gasket.
^ The thermostat must be installed with the jiggle pin (A) facing to front side.
^ At this time, set the jiggle pin of thermostat for front side.

Tightening torque: 6.4 Nm (0.65 kgf-m, 4.7 ft. lbs.)
2. Connect radiator outlet hose to thermostat cover.
3. Fill coolant.

INSPECTION





Replace the thermostat if the valve does not close completely at an ambient temperature or if the following test shows unsatisfactory results. Immerse the thermostat and a thermometer in water. Raise water temperature gradually, and measure the temperature and valve lift when the valve begins to open and when the valve is fully opened. During the test, agitate the water for even temperature distribution. The measurement should be to the specification.
Starts to open: 76.0 - 80.0°C (169 - 176°F)
Fully opens: 91°C (196°F)