4 Runner 2WD L4-2693cc 2.7L DOHC MFI (1997)
Thermostat: Testing and Inspection
NOTE: The thermostat is numbered with the valve opening temperature.
(a)
Immerse the thermostat in water and gradually heat the water.
(b) Check the valve opening temperature.
Valve opening temperature: 80° - 84° C (176° -183° F)
If the valve opening temperature is not as specified, replace the thermostat.
(c)
Check the valve lift.
Valve lift: At 95° C (203° F): 8 mm (0.31 inch) or more.
If the valve lift is not as specified, replace the thermostat.
(d) 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.
