RADIATOR ON-VEHICLE INSPECTION

PROCEDURE

  1. CHECK RADIATOR CAP SUB-ASSEMBLY

    CAUTION:

    Do not remove the radiator cap while the engine and radiator are still hot. Pressurized, hot engine coolant and steam may be released and cause serious burns.

    1. A272544E02

      Measure the valve opening pressure.

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

      2. Check that rubber packing 1, 2 and 3 are 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.

      5. A272545C01

        *1

        Radiator Cap

        *2

        Radiator Cap Tester

        *a

        More than 30°

        When using a radiator cap tester, tilt it more than 30°.

      6. Pump the radiator cap tester several times and check the maximum pressure.*1

        Pumping speed

        1 pump per second

        Tip:

        *1: Even if the radiator cap cannot maintain the maximum pressure, it is not necessarily defective.

        Standard Judgment Criterion

        Item

        Specified Condition

        Standard value

        (for brand-new cap)

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

        Minimum standard value

        (for used cap)

        79 kPa (0.8 kgf/cm2, 11.4 psi)

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

  2. INSPECT FINS FOR BLOCKAGE

    A112201

    1. If the fins are clogged, wash them with water or a steam cleaner and dry them with compressed air.

      Note:

      • To avoid damaging the fins, the injection direction should be at right angles to the core surface.

      • If the steam cleaner is too close to the core, there is a possibility of damaging the fins, so maintain the following injection distances.

        Standard Injection Distance

        Injection Pressure

        Specified Condition

        2942 to 4903 kPa

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

        300 mm (11.8 in.)

        4903 to 7845 kPa

        (50.0 to 80.0 kgf/cm2, 711 to 1138 psi)

        500 mm (19.7 in.)

      • If the fins are bent, straighten them with a screwdriver or pliers.

      • Do not expose electronic components to water.

    2. Dry the fins with compressed air.