Page 2833 of 4323
B17478
AB
± COOLINGWATER PUMP
CO±9
2825 Author: Date:
2005 SEQUOIA (RM1146U)
(f) Install the water inlet and housing assembly with the 2
bolts. Alternately tighten the bolts.
Torque: 18 N´m (185 kgf´cm, 13 ft´lbf)
HINT:
Each bolt length is indicated in the illustration.
Bolt length:
76 mm (3.00 in.) for A
22 mm (0.87 in.) for B
(g) Connect the water bypass hose to the water inlet housing.
3. INSTALL NO.2 IDLER PULLEY (See page EM±23)
4. INSTALL TIMING BELT (See page EM±23)
5. FILL WITH ENGINE COOLANT
6. START ENGINE AND CHECK FOR ENGINE COOLANT
LEAKS
7. RECHECK ENGINE COOLANT LEVEL
Page 2834 of 4323
CO0IU±07
B05865
Water InletThermostat
Gasket
N´m (kgf´cm, ft´lbf) : Specified torque
Non±reusable part
19 (195, 14)
CO±10
± COOLINGTHERMOSTAT
2826 Author: Date:
2005 SEQUOIA (RM1146U)
THERMOSTAT
COMPONENTS
Page 2835 of 4323
CO0IV±04
B05866
± COOLINGTHERMOSTAT
CO±11
2827 Author: Date:
2005 SEQUOIA (RM1146U)
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 INLET
HOUSING
Remove the 3 nuts and disconnect the water inlet from the wa-
ter inlet housing.
3. REMOVE THERMOSTAT
(a) Remove the thermostat.
(b) Remove the gasket from the thermostat.
Page 2836 of 4323
CO0IW±08
P08849
CO0929
CO0949
Valve Lift CO±12
± COOLINGTHERMOSTAT
2828 Author: Date:
2005 SEQUOIA (RM1146U)
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 to 84°C (176 to 183°F)
If the valve opening temperature is not as specified, replace the
thermostat.
(c) Check the valve lift.
Valve lift: 10 mm (0.39 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.
Page 2837 of 4323
CO0IX±05
B07218
Jiggle Valve30°30°
± COOLINGTHERMOSTAT
CO±13
2829 Author: Date:
2005 SEQUOIA (RM1146U)
INSTALLATION
1. PLACE THERMOSTAT IN WATER INLET HOUSING
(a) Install a new gasket to the thermostat.
(b) Insert the thermostat into the water inlet housing with the
jiggle valve facing straight upward.
HINT:
The jiggle valve may be set within 30° of either side of the pre-
scribed position.
2. INSTALL WATER INLET
Install the water inlet with the 3 nuts.
Torque: 19 N´m (195 kgf´cm, 14 ft´lbf)
3. FILL WITH ENGINE COOLANT
4. START ENGINE AND CHECK FOR COOLANT LEAKS
5. RECHECK ENGINE COOLANT LEVEL
Page 2838 of 4323
B14807
CO1B9±02
CO±14
± COOLINGRADIATOR
2830 Author: Date:
2005 SEQUOIA (RM1146U)
RADIATOR
ON±VEHICLE CLEANING
INSPECT FINS FOR BLOCKAGE
If fins are clogged, wash them with water or a steam cleaner and
dry with compressed air.
NOTICE:
If the distance between the steam cleaner and the
core is too close, there is a possibility of damaging
the fin, so keep the following injection distance.
Injection PressureInjection Distance
2,942 to 4,903 kpa
(30 to 50 kg/cm2,
427 to 711 psi)300 mm (11.811 in)
4,903 to 7,845 kpa
(50 to 80 kg/cm2,
711 to 1,138 psi)500 mm (19.685 in)
If the fins are bent, straighten them with a screwdriver
or pliers.
Never apply water directly onto the electronic compo-
nents.
Page 2839 of 4323

CO0IZ±08
CO1242
Radiator Cap Tester
Radiator Cap
30° or More
B07240
Radiator Cap Tester
± COOLINGRADIATOR
CO±15
2831 Author: Date:
2005 SEQUOIA (RM1146U)
ON±VEHICLE INSPECTION
1. REMOVE RADIATOR CAP
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.
Opening pressure:
Standard74 to 103 kPa (0.75 to 1.05 kgf/cm2,10.7 to 14.9 psi)
Minimum59 kPa (0.6 kgf/cm2, 8.6 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
Page 2840 of 4323
CO1D2±01
B07246
Radiator Assembly
A/T Oil Cooler Hose
Engine Under Cover (4WD)Upper Radiator Hose
Lower Radiator Hose
x 5
N´m (kgf´cm, ft´lbf) : Specified torque
12 (120, 9)
No.1 Fan Shroud
No.2 Fan Shroud
Engine Under Cover (2WD)
Clip
Clip
CO±16
± COOLINGRADIATOR
2832 Author: Date:
2005 SEQUOIA (RM1146U)
COMPONENTS