Last Modified: 11-29-2007 1.6 G
Service Category: Engine/Hybrid System Section: Cooling
Model Year: 2008 Model: Sequoia Doc ID: RM000000XYW03DX
Title: 2UZ-FE COOLING: RADIATOR: ON-VEHICLE INSPECTION (2008 Sequoia)

ON-VEHICLE INSPECTION

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.

1. INSPECT RADIATOR CAP SUB-ASSEMBLY

(a) Measure the valve opening pressure.

(1) If there are water stains or foreign matter on rubber packing 1, 2 or 3, clean it with water and finger scouring.

(2) Check that rubber packing 1, 2 or 3 is not deformed, cracked or swollen.

(3) Check that rubber packing 3 and 4 are not stuck together.

(4) Apply engine coolant to rubber packing 2 and 3 before using a radiator cap tester.

(5) When using the cap tester, tilt it more than 30°.

(6) Pump the cap tester several times, and check the maximum pressure*.

Pumping speed:

1 pump per second

HINT:

*: Even if the cap cannot maintain the maximum pressure, it is not a defect.

Standard Judgment Criterion:

Item

Specified Condition

Standard valve

(for brand-new cap)

93 to 123 kPa (1.0 to 1.3 kgf/cm2, 13.5 to 18 psi)

Minimum standard valve

(after using cap)

79 kPa (0.8 kgf/cm2, 11.4 psi)

If the maximum pressure is less than the minimum standard valve, replace the radiator cap sub-assembly.

2. INSPECT FINS FOR BLOCKAGE

(a) Check that the fins of the radiator core are not blocked with leaves, dirt, or insects.

If the fins are blocked, wash them with water or a steam cleaner.

NOTICE:

  • If the distance between the steam cleaner and core is too close, the fins may be damaged.
  • Keep the following injection distance.

    Standard Injection Distance:

    Specified Condition

    Injection Pressure

    300 mm (11.8 in.)

    2942 to 4903 kPa (30.0 to 50.0 kgf/cm2, 427 to 711 psi)

    500 mm (19.7 in.)

    4903 to 7845 kPa (50.0 to 80.0 kgf/cm2, 711 to 1138 psi)
  • If the fins are bent, straighten them with a screwdriver or pliers.
  • Never apply water directly onto the electric components.

    • (b) Dry the fins with compressed air.