Lexus GS300/400 (2000 year). Service manual - part 118

CO0A6–01

CO–14

–

COOLING (2JZ–GE)

RADIATOR

1552

RADIATOR

ON–VEHICLE CLEANING

CLEAN RADIATOR
Using water or a steam cleaner, remove any mud or dirt from the radiator core.
NOTICE:
If using a high pressure type cleaner, be careful not to deform the fins of the radiator core. (i.e. Main-
tain a distance between the cleaner nozzle and radiator core.)

CO0A7–01

CO1242

Radiator Cap Tester

Radiator Cap

30

°

 or More

B01882

Radiator Cap Tester

–

COOLING (2JZ–GE)

RADIATOR

CO–15

1553

ON–VEHICLE INSPECTION

1.

REMOVE RADIATOR CAP

Remove the radiator cap from the radiator.
CAUTION:
To avoid the danger of being burned, do not remove the ra-
diator cap while the engine and radiator are still hot, as fluid
and steam can be blown out under pressure.

2.

INSPECT RADIATOR CAP

NOTICE:

If the radiator cap has contaminations, always rinse
it with water.

Before using a radiator cap tester, wet the relief valve
and pressure valve with engine coolant or water.

When performing steps (a) and (b) below, keep the
tester at an angle of over 30

°

 above the horizontal.

(a)

Using a radiator cap tester, slowly pump the tester and
check that air is coming from the vacuum valve.
Pump speed: 1 push/(3 seconds or more)

NOTICE:
Push the pump at a constant speed.
If air is not coming from the vacuum valve, replace the radiator
cap.
(b)

Pump the radiator cap tester, and measure the relief valve
opening pressure.
Pump speed: 1 push within 1 second

NOTICE:
This pump speed is for the first pump only (in order to close
the vacuum valve). After this, the pump speed can be re-
duced.

Standard opening pressure:
93 – 123 kPa (0.95 – 1.25 kgf/cm

2

, 13.5 – 17.8 psi)

Minimum opening pressure:
78 kPa (0.8 kgf/cm

2

, 11.4 psi)

HINT:
Use the tester’s maximum reading as the opening pressure.
If the opening pressure is less than minimum, replace the radia-
tor cap.
3.

INSPECT COOLING SYSTEM FOR LEAKS

(a)

Fill the radiator with coolant and attach a radiator cap tes-
ter.

(b)

Warm up the engine.

(c)

Pump it to 118 kPa (1.2 kgf/cm

2

, 17.1 psi), and check that

the pressure does not drop.

If the pressure drops, check the hoses, radiator or water pump
for leaks. If no external leaks are found, check the heater core,
cylinder block and head.
4.

REINSTALL RADIATOR CAP

CO0A8–01

B02029

Air Cleaner Inlet

Upper Radiator Support

Air Cleaner and MAF
Meter Assembly

Lower Radiator Support

Intake Air Resonator

Engine Under Cover

x 18

ECT Switch 
Connector for 
Electric Cooling
Fan

Lower Radiator Hose

Upper Radiator Support

Upper Radiator Hose

ECM Outlet Duct

Wire Clamp

Electric Cooling
Fan Connector

Oil Cooler Hose 
for A/T

Engine Wire 
Clamp

MAF Meter Connector

Radiator and Electric
Cooling Fan Assembly

EVAP Hose

CO–16

–

COOLING (2JZ–GE)

RADIATOR

1554

COMPONENTS

B00917

Radiator Reservoir Hose

Electric Cooling Fan
Assembly

Radiator

x 6

B01859

 Packing

Upper Tank

 O–Ring

Core

Drain Plug

 Non–reusable part

 Packing

 Packing

 Packing

 Packing

 Packing

 O–Ring

 O–Ring

Pipe

Pipe

Plate Washer

Nut

Nut

 O–Ring

ECT Switch for Electric
Cooling Fan

 O–Ring

 O–Ring

Lower Tank

Radiator Cap

Oil Cooler

–

COOLING (2JZ–GE)

RADIATOR

CO–17

1555