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

WARNING: This page is about a different car, the 2025 Toyota GR Corolla, 2024 Toyota GR Corolla, and 2023 Toyota GR Corolla. However, it is still accessible from the selected car via links, so may be relevant.
  1. INSPECT FOR COOLANT LEAK 
    WARNING:

    Do not remove the reserve tank cap, radiator cap sub-assembly or radiator drain cock plug 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. Fill the radiator reserve tank assembly with engine coolant, and then install a radiator cap tester.
      GTY1107021Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Radiator Cap Tester
    3. Warm up the engine.
    4. Pump the radiator cap tester to 123 kPa (1.3 kgf/cm 2 , 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.
    5. Remove the radiator cap tester.
    6. Install the reserve tank cap.
  2. INSPECT RADIATOR RESERVE TANK ENGINE COOLANT LEVEL 
    1. Check that the engine coolant level is between the LOW line and FULL line when the engine is cold.
      GTY807864Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a FULL Line
      *b LOW Line
      NOTE:

      Do not substitute plain water for engine coolant.

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

  3. INSPECT ENGINE COOLANT QUALITY 
    WARNING:

    Do not remove the reserve tank cap, radiator cap sub-assembly or radiator drain cock plug 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 that there are no excessive deposits of rust or scale around the reserve tank cap and engine coolant hole. Also, the engine coolant should be free of oil.

      If excessively dirty, clean the engine coolant passage and replace the engine coolant.

    3. Install the reserve tank cap.
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