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Home >> Toyota >> 2020 >> Corolla L >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 71 (Engine Cooling System (M20A-FKS) - Service Information) >> RADIATOR (w/o Cooling Fan ECU) >> On-Vehicle Inspection [09/2019 - 11/2022] >> Procedure

On-Vehicle Inspection [09/2019 - 11/2022]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. INSPECT RESERVE TANK CAP (for Fully Sealed Type) 
    WARNING:

    Do not remove the reserve tank cap and air release valve 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.
      GTY493011Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a O-ring
      *b Rubber Packing
      1. If there are water stains or foreign matter on the O-ring, clean it with water and finger scouring.
      2. Check that the O-ring is not deformed, cracked or swollen.
      3. Apply engine coolant to the O-ring and rubber packing before using a radiator cap tester.
      4. Install the radiator cap tester to the reserve tank cap.
      5. When using the radiator cap tester, tilt it upwards 30° or more.
        GTY488804Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *1 Reserve Tank Cap
        *a Radiator Cap Tester
        *b 30° or more
      6. Pump the radiator cap tester several times, and check the maximum pressure.

        Pump Speed

        1 pump per second

        Result

        Item Specified Condition
        Standard pressure
        (for brand-new reserve tank cap)        		 93 to 123 kPa (0.9 to 1.3 kgf/cm2 , 13.5 to 18.0 psi)
        Minimum pressure
        (for used reserve tank cap)        		 79 kPa (0.8 kgf/cm2 , 11.5 psi)

        HINT: 

        Even if the reserve tank cap cannot maintain the maximum pressure, it is not a defect.

        If the maximum pressure is less than the minimum pressure, replace the reserve tank cap.

      7. Remove the radiator cap tester from the reserve tank cap.
  2. INSPECT RADIATOR CAP SUB-ASSEMBLY (for Non-Fully Sealed Type) 
    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 packings (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.

  3. 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 fan with motor assembly.

      Refer to REMOVAL [09/2019 - 09/2022] , or refer to REMOVAL [09/2022 - 11/2022] 

    2. Shine an electric light at the radiator assembly and cooler condenser assembly from the front of the cooler condenser assembly and check the radiator assembly for clogging using a mirror.
      GTY915008Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a OK *b NG
      *c Electric Light *d Mirror

      OK

      The radiator assembly is not clogged.

      If the radiator assembly is clogged, clean it.

    3. Install the fan with motor assembly.

      Refer to INSTALLATION [09/2019 - 11/2022] 

  4. 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 fan with motor assembly.

      Refer to REMOVAL [09/2019 - 09/2022] , or refer to REMOVAL [09/2022 - 11/2022] 

    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 of the cooler condenser assembly 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.
        GTY925504Courtesy 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. Clean the radiator assembly.
      1. Insert the washer nozzle into the space in rear of the radiator assembly and spray it.
        GTY925511Courtesy 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.
    5. 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.

    6. Remove the piece of cloth from the opening of each air duct.
    7. Install the fan with motor assembly.

      Refer to INSTALLATION [09/2019 - 11/2022] 

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