Thermostat: Service and Repair

Removal

NOTE:
Driving with the thermostat removed would have an adverse effect, causing a lowering of cooling efficiency. Do not remove the thermostat, even if the engine tends to overheat.

1. Drain engine coolant so its level is below thermostat.
2. Remove the water inlet (A) and the thermostat with gasket.






Inspection

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




2. Check the valve opening temperature.

Valve opening temperature :82 °C(177 °F)
Full opening temperature :95 °C(205 °F)

If the valve opening temperature is not as specified, replace the thermostat.
3. Check the valve lift.

Valve lift :8mm(0.3in.) or more at 95 °C(205 °F)

If the valve lift is not as specified, replace the thermostat.

Installation

1. Place thermostat in thermostat housing.
(1) Install the thermostat with the jiggle valve upward.
(2) Install a new gasket (A) to the thermostat (B).




2. Install water inlet (A).

Tightening torque
14.7 - 19.6Nm (1.5 - 2.0kgf.m, 10.8 - 14.5lb-ft)




3. Fill with engine coolant.
4. Start engine and check for leaks.