COOLING SYSTEM ON-VEHICLE INSPECTION

CAUTION / NOTICE / HINT

CAUTION:

Be sure that the ignition switch is off if you work near the electric cooling fans or radiator grille. With the ignition switch ON, the electric cooling fans may automatically start if the engine coolant temperature is high or the air conditioning is on.

PROCEDURE


  1. INSPECT FOR COOLANT LEAK

    CAUTION:

    To avoid the danger of being burned, do not remove the radiator cap sub-assembly while the engine and radiator assembly are still hot. Thermal expansion will cause hot engine coolant and steam to blow out from the radiator assembly.


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      Text in Illustration
      *1 Radiator Cap Tester

      Fill the radiator assembly with engine coolant, and attach a radiator cap tester.

    2. Pump the tester to 137 kPa (1.4 kgf/cm2, 19.9 psi), and then check that the pressure does not drop.

      If the pressure drops, check the hoses, radiator assembly and water pump assembly for leaks. If there are no signs or traces of external engine coolant leaks, check the heater core, cylinder block and head.

  2. INSPECT RESERVOIR TANK ENGINE COOLANT LEVEL


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      Text in Illustration
      *a FULL Line
      *b LOW Line

      The engine coolant should be between the LOW and FULL lines when the engine is cold.

      Tech Tips

      If it is below the LOW line, check for leaks and add Toyota Super Long Life Coolant (SLLC) or similar high quality ethylene glycol based non-silicate, non-amine, non-nitrite, and non-borate coolant with long-life hybrid organic acid technology up to the FULL line.

  3. INSPECT ENGINE COOLANT QUALITY


    1. Remove the radiator cap sub-assembly.

      CAUTION:

      To avoid the danger of being burned, do not remove the radiator cap sub-assembly while the engine and radiator assembly are still hot.

      Thermal expansion will cause hot engine coolant and steam to blow out from the radiator assembly.

    2. Check for excessive deposits of rust or scale around the radiator cap sub-assembly and radiator filler hole. The engine coolant should be free of oil.

      If excessively dirty, replace the engine coolant.

    3. Reinstall the radiator cap sub-assembly.