T100 SR5 Extra Cab Pickup 2WD V6-3.4L (5VZ-FE) (1997)
Thermostat: Testing and Inspection
NOTE: The thermostat is numbered according to the valve opening temperature.
(a)
Immerse the thermostat in water and gradually heat the water.
(b) Check the valve opening temperature and valve lift.
Valve opening temperature: 80° - 84° C (176° -183° F)
Valve lift: At 95° C (203° F): 8.5 mm (0.335 inch) or more.
If the valve opening temperature and valve lift are not within specifications, replace the thermostat.
(c)
Check that the valve is fully closed when the thermostat is at low temperatures (below 40° C (104° F)).
If not closed, replace the thermostat.