Thermostat: Service and Repair

Removal





1. Disconnect negative battery cable.





2. Drain engine coolant.





3. Remove bolt and nut of thermostat housing.





4. Remove thermostat housing and thermostat.

Inspection
1. Visually check that thermostat is airtight.
2. Place thermostat and a thermometer in water.





3. Gradually heat water and check following.
Initial opening temperature: 177 - 182°F (80.5 - 83.5°C)
Full open temperature: 203°F (95°C)
Full open lift: 0.31 inch (8.0 mm) min.

Replacement





1. Install thermostat into cylinder head with jiggle pin positioned up.
2. Install new gasket.





3. Place thermostat housing and tighten bolt and nut.
Tightening torque: 14 - 19 ft. lbs. (19 - 26 Nm, 1.9 - 2.6 kg-m)
4. Fill radiator with specified amount and type of engine coolant.





5. Connect negative battery cable.
6. Start engine and check for leaks.