COOLING SYSTEM ON-VEHICLE INSPECTION

CAUTION / NOTICE / HINT

CAUTION:

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.

PROCEDURE


  1. INSPECT FOR COOLANT LEAK


    1. Remove the radiator cap sub-assembly.

    2. Fill the radiator reserve tank assembly with engine coolant, and then install a radiator cap tester.

    3. Warm up the engine.

    4. Pump the radiator cap tester to 118 kPa (1.2 kgf/cm2, 17 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 coolant leaks, check the heater core, cylinder block and cylinder head.

    5. Remove the radiator cap tester.

    6. Install the radiator cap sub-assembly.

  2. INSPECT ENGINE COOLANT LEVEL IN RESERVOIR


    1. Check that the engine coolant level is between the low and full lines when the engine is cold.

      If the engine coolant level is low, check for leaks and add "TOYOTA Super Long Life Coolant" or similar high quality ethylene glycol based non-silicate, non-amine, non-nitrite and non-borate coolant with long life hybrid organic acid technology to the full line.

      Note

      Do not substitute plain water for engine coolant.

  3. INSPECT ENGINE COOLANT QUALITY


    1. Remove the radiator cap sub-assembly.

    2. Check if there are any excessive deposits of rust or scale around the radiator cap sub-assembly and water filler 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 radiator cap sub-assembly.