Valve opening temperature to C to F

If the valve opening temperature is not as specified, replace the thermostat.

2007 ENGINE Cooling - Sequoia

Fig. 17: Immersing Thermostat In Water Then Gradually Heat Water Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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.

2007 ENGINE Cooling - Sequoia

Fig. 18: Inspecting Valve Lift

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. INSTALLATION

Fig. 18: Inspecting Valve Lift

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC. INSTALLATION

1. REPLACE 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 prescribed position.

2. INSTALL WATER INLET

a. Install the water inlet with the 3 nuts.

3. FILL WITH ENGINE COOLANT

4. START ENGINE AND CHECK FOR COOLANT LEAKS

5. RECHECK ENGINE COOLANT LEVEL

2007 ENGINE Cooling - Sequoia

Fig. 19: Inserting Thermostat Into Water Inlet Housing With Jiggle Valve Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

RADIATOR

COMPONENTS

2007 ENGINE Cooling - Sequoia

LOWER RADIATOR HOSE AH" OIL COOLER HOSE

ENGINE UNDER COVER NO.1 (2WD)

ENGINE UNDER COVER NO.1 (2WD)

Fig. 20: Identifying Radiator Components & Torque Specification Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

ON-VEHICLE INSPECTION

1. REMOVE RADIATOR CAP

2007 ENGINE Cooling - Sequoia

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

Fig. 21: Using A Radiator Cap Tester Checking Air Coming From Vacuum Valve Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

2. INSPECT RADIATOR CAP

NOTE:

• 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)

NOTE:

Push the pump at a constant speed.

2007 ENGINE Cooling - Sequoia

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

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