Lexus GS300/400 (2000 year). Service manual - part 117

CO0A2–03

B01987

Thermostat

 Gasket

Water Inlet

 Non–reusable part

CO–10

–

COOLING (2JZ–GE)

THERMOSTAT

1548

THERMOSTAT

COMPONENTS

CO0A3–01

B01940

–

COOLING (2JZ–GE)

THERMOSTAT

CO–11

1549

REMOVAL

HINT:
Removal of the thermostat would have an adverse effect, caus-
ing a lowering of cooling efficiency. Do not remove the thermo-
stat, even if the engine tends to overheat.
1.

DRAIN ENGINE COOLANT

2.

DISCONNECT WATER INLET FROM WATER PUMP,
AND REMOVE THERMOSTAT

(a)

Remove the 2 nuts holding the water inlet to the water
pump, and disconnect the water inlet from the water
pump.

(b)

Remove the thermostat.

(c)

Remove the gasket from the thermostat.

CO0A4–01

P11116

CO0601

P03242

Valve
Lift

CO–12

–

COOLING (2JZ–GE)

THERMOSTAT

1550

INSPECTION

INSPECT THERMOSTAT
HINT:
The thermostat is numbered with the valve opening tempera-
ture.

(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 lift is not as specified, replace the thermostat.

(c)

Check the valve lift.
Valve lift: 8.5 mm (0.335 in.) or more at 95

°

C (203

°

F)

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.

CO0A5–01

P11117

Protrusion

Jiggle Valve

–

COOLING (2JZ–GE)

THERMOSTAT

CO–13

1551

INSTALLATION

1.

PLACE THERMOSTAT IN WATER INLET

(a)

Install a new gasket to the thermostat.

(b)

Align the jiggle valve of the thermostat with the protrusion
of the water inlet.

2.

INSTALL WATER INLET

Install the water inlet with the 2 nuts.

Torque: 9.0 N·m (90 kgf·cm, 80 in.·lbf)

3.

FILL WITH ENGINE COOLANT

4.

START ENGINE AND CHECK FOR COOLANT LEAKS