Removal Of Thermostat; Inspection Of Thermostat - Toyota 1PZ Repair Manual

CO-10 COOLING SYSTEM - Thermostat
THERMOSTAT

REMOVAL OF THERMOSTAT

1. DRAIN ENGINE COOLANT (See page CO-5)
2. REMOVE WATER INLET
Remove the three bolts and water inlet from the water inlet
housing.
3. REMOVE THERMOSTAT
CO0948

INSPECTION OF THERMOSTAT

INSPECT THERMOSTAT
HINT: The thermostat is numbered with the valve open-
ing temperature.
C00941
(a) Immerse the thermostat in water and gradually heat
the water.
(b) Check the valve opening temperature.
Valve opening temperature:
If the valve opening temperature is not as specified, replace
the thermostat.
CO0929
(c) Check the valve lift.
Valve lift: 10 mm (0.39 in.) or more at 90°C (194°F)
If the valve lift is not as specified, replace the thermostat.
(d) Check that the valve spring is tight when the thermo-
stat is fully closed.
If necessary, replace the thermostat.
Valve Lift
CO0949
7 4 - 7 8 X (165-172°F)