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
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