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On-Vehicle Inspection [07/2020 - ]: Procedure

  1. INSPECT ENGINE COOLANT LEVEL IN RESERVOIR TANK 
    WARNING:

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

    1. Check that the engine coolant level is between the L line and F line when the engine is cold.

      If the engine coolant level is low, check for leaks and add engine coolant to the F line.

      NOTE:

      Do not substitute plain water for engine coolant.

      GTY830396Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a F Line
      *b L Line
    2. Remove the radiator cap sub-assembly and check that there is coolant up to the engine side coolant filler hole.
    3. Install the radiator cap sub-assembly.
      NOTE:

      When installing the radiator cap sub-assembly, apply coolant to the O-ring of the radiator cap sub-assembly.

  2. INSPECT ENGINE COOLANT QUALITY 
    WARNING:

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

    1. Remove the reserve tank cap.
    2. Check if there are any excessive deposits of rust or scale around the reserve tank cap and water filler hole. Also, the engine coolant should be free of oil.

      If excessively dirty, replace the engine coolant.

    3. Install the reserve tank cap.
  3. INSPECT FOR COOLANT LEAK 
    WARNING:

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

    1. Remove the service hole cover from the lower radiator air deflector.
    2. Remove the reserve tank cap.
    3. Fill the radiator assembly with engine coolant, and then install a radiator cap tester.
      GTY795913Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Radiator Cap Tester
    4. Warm up the engine.
    5. Pump the radiator cap tester to 123 kPa (1.3 kgf/cm2 , 18 psi), and then check that the pressure does not drop.
      • If the pressure drops, check the hoses, radiator assembly and engine water pump assembly for leaks.
      • If there are no signs of external engine coolant leaks, check the heater core, cylinder block sub-assembly and cylinder head sub-assembly.
    6. Remove the radiator cap tester.
    7. Install the reserve tank cap.
    8. Install the service hole cover to the lower radiator air deflector.
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