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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Engine Mechanical >> Cooling System (Mechanical) >> Engine Cooling System (2GR-FKS) - Service Information >> Radiator >> On-Vehicle Inspection [12/2019 - 09/2020] >> Procedure

On-Vehicle Inspection [12/2019 - 09/2020]: Procedure

  1. CHECK RADIATOR CAP SUB-ASSEMBLY 
    WARNING:

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

    1. Measure the valve opening pressure.
      GTY430413Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Rubber Packing (1)
      *b Rubber Packing (2)
      *c Rubber Packing (3)
      *d Valve Seat
      1. If there are water stains or foreign matter on the rubber packing (1), (2) or (3), clean the part(s) with water and finger scouring.
      2. Check that the rubber packings (1), (2) and (3) are not deformed, cracked or swollen.
      3. Check that the rubber packing (3) and valve seat are not stuck together.
      4. Apply engine coolant to the rubber packings (2) and (3) before using a radiator cap tester.
      5. When using the radiator cap tester, tilt it upward 30° or more.
        GTY452114Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *1 Radiator Cap Sub-assembly
        *a Radiator Cap Tester
        *b 30° or more
      6. Pump the radiator cap tester several times, and check the maximum pressure.

        Pumping Speed

        1 pump per second

        Result

        Item Specified Condition
        Standard pressure
        (for brand-new radiator cap sub-assembly)        		 74 to 103 kPa (0.8 to 1.1 kgf/cm2 , 10.7 to 14.9 psi)
        Minimum pressure
        (for used radiator cap sub-assembly)        		 59 kPa (0.6 kgf/cm2 , 8.6 psi)

        HINT: 

        Even if the radiator cap sub-assembly cannot maintain the maximum pressure, it is not a defect.

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

  2. CHECK RADIATOR ASSEMBLY FOR CLOGGING 
    WARNING:

    To prevent burns, do not touch the engine or other high temperature components while the engine is hot.

    1. Remove the cool air intake duct seal.

      Refer to PROCEDURE - Step 1

    2. Remove the inlet air cleaner assembly.

      Refer to PROCEDURE - Step 6

    3. Shine an electric light at the radiator assembly from the front and check the radiator assembly for clogging using a mirror.
      GTY934314Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a OK *b NG
      *c Electric Light *d Mirror
      *e Areas to be checked - -

      OK

      The radiator assembly is not clogged.

      If the radiator assembly is clogged, clean it.

    4. Install the inlet air cleaner assembly.

      Refer to PROCEDURE - Step 20

    5. Install the cool air intake duct seal.

      Refer to PROCEDURE - Step 4

  3. CLEAN RADIATOR ASSEMBLY 
    WARNING:

    To prevent burns, do not touch the engine or other high temperature components while the engine is hot.

    1. Remove the No. 2 radiator air guide.

      See step  16

    2. Cover the opening of each air duct with a piece of cloth.
    3. Clean the cooler condenser assembly.
      1. Check that the washer nozzle is not clogged.
      2. Insert the washer nozzle into the space in front and spray it.
        NOTE:
        • Clean the fins of the cooler condenser assembly by spraying the entire area for 150 seconds. Repeat this process twice.
        • Set the air pressure to 0.4 MPa (4.1 kgf/cm2 , 58 psi).
        • Check that water sprays in mist form from the nozzle.
        • Keep the nozzle parallel to the cooler condenser assembly.
        • Do not allow the nozzle to contact the fins of the cooler condenser assembly.
        • Keep the nozzle moving while spraying water.
        • Do not spray the cooler compressor assembly or generator assembly excessively.
        GTY935482Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Leave the cooler condenser assembly as is for 10 minutes to let the water penetrate the dirt.
      4. Clean the cooler condenser assembly again.
        NOTE:
        • Clean the fins of the cooler condenser assembly by spraying the entire area for 150 seconds. Repeat this process 4 times.
        • Set the air pressure to 0.4 MPa (4.1 kgf/cm2 , 58 psi).
        • Check that water sprays in mist form from the nozzle.
        • Keep the nozzle parallel to the cooler condenser assembly.
        • Do not allow the nozzle to contact the fins of the cooler condenser assembly.
        • Keep the nozzle moving while spraying water.
        • Do not spray the cooler compressor assembly or generator assembly excessively.
      5. Using an air blow gun, dry the cooler condenser assembly for 3 minutes.
    4. Disconnect the cooling fan motor connector.
      GTY881583Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Disengage the clamp to disconnect the wire harness from the fan with motor assembly.
    6. Rotate the lever while pushing the lock, and disconnect the cooling fan motor connector.
      GTY935722Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:

      After disconnecting the cooling fan motor connector, make sure that dirt, water or other foreign matter does not contact the connecting parts of the cooling fan motor connector.

    7. Disengage the 2 clamps to disconnect the wire harness from the fan with motor assembly.
    8. Disengage the 2 claws and separate the fan with motor assembly from the radiator assembly.
      GTY899358Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    9. Clean the radiator assembly.
      1. Insert the washer nozzle between the radiator assembly and fan with motor assembly and spray the radiator assembly.
        GTY880498Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        NOTE:
        • Clean the fins of the radiator assembly by spraying the entire area for 150 seconds. Repeat this process twice.
        • Set the air pressure to 0.4 MPa (4.1 kgf/cm2 , 58 psi).
        • Check that water sprays in mist form from the nozzle.
        • Keep the nozzle parallel to the radiator assembly.
        • Do not allow the nozzle to contact the fins of the radiator assembly.
        • Keep the nozzle moving while spraying water.
      2. Leave the radiator assembly as is for 10 minutes to let the water penetrate the dirt.
      3. Clean the radiator assembly again.
        NOTE:
        • Clean the fins of the radiator assembly by spraying the entire area for 150 seconds. Repeat this process 4 times.
        • Set the air pressure to 0.4 MPa (4.1 kgf/cm2 , 58 psi).
        • Check that water sprays in mist form from the nozzle.
        • Keep the nozzle parallel to the radiator assembly.
        • Do not allow the nozzle to contact the fins of the radiator assembly.
        • Keep the nozzle moving while spraying water.
      4. Using an air blow gun, dry the radiator assembly for 3 minutes.
    10. Check the fins of the radiator assembly for clogs again.

      If the radiator assembly is clogged, clean the cooler condenser assembly and radiator assembly again.

    11. Check that the 2 guides at the bottom are engaged to the radiator assembly.
      GTY881587Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    12. Engage the 2 claws to install the fan with motor assembly to the radiator assembly.
    13. Engage the 2 clamps to connect the wire harness to the fan with motor assembly.
      GTY881584Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    14. Connect the cooling fan motor connector and rotate the lever to lock it.
      NOTE:
      • When connecting the cooling fan motor connector, make sure that the connecting parts of the cooling fan motor connector are free of dirt, water and other foreign matter.
      • Be sure to securely connect the cooling fan motor connector.
    15. Engage the clamp to connect the wire harness to the fan with motor assembly.
    16. Connect the cooling fan motor connector.
    17. Remove the piece of cloth from the opening of each air duct.
    18. Install the No. 2 radiator air guide.

      See step  8

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