Engine Cooling System: 1F-9
Thermostat Removal and Installation (For J20
Engine Model)
S5JB0A1606022
Removal
1) Drain coolant referring to “Cooling System Draining:
”.
2) Disconnect radiator outlet hose from thermostat cap
(1).
3) Remove thermostat cap (1) from water pump (2).
4) Remove thermostat from water pump (2).
Installation
Reverse removal procedure for installation noting the
following points.
• When positioning thermostat (1) on water pump case,
be sure to position it so that air bleed valve (2) comes
at match mark (3) and into the recession of water
pump case.
• Use new O-ring when installing.
• Refill cooling system referring to Step 7) to 17) of
“Cooling System Flush and Refill: ”.
• Verify that there is no coolant leakage at each
connection.
Thermostat Inspection
S5JB0A1606007
• Make sure that air bleed valve (1) of thermostat is
clean.
Should this valve be clogged, engine would tend to
overheat.
• Check to make sure that valve seat (2) is free from
foreign matters which would prevent valve from
seating tight.
• Check thermostat seal (3) for breakage, deterioration
or any other damage.
• Check thermostatic movement of wax pellet as
follows:
a. Immerse thermostat (1) in water, and heat water
gradually.
b. Check that valve starts to open at specific
temperature.
Temperature at which valve begins to open
80 – 84
°
C (176 – 183
°
F)
Temperature at which valve become fully open
95 – 97
°
C (203
°
F)
Valve lift
More than 8 mm at 95
°
C (203
°
F)
If valve starts to open at a temperature substantially
below or above specific temperature, thermostat unit
should be replaced with a new one. Such a unit, if
reused, will bring about overcooling or overheating
tendency.
I5JB0A161009-01
I2RH01160010-01
2. Thermometer
3. Heater
I3RM0A160008-01
I2RH01160012-01
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