COOLING SYSTEM ON-VEHICLE INSPECTION


  1. TILT UP CAB

    CAUTION:


    • Make sure that the vehicle is on a level surface before tilting the cab up.

    • Make sure that all the doors are closed before tilting the cab up.

    • Make sure that nobody is inside or near the cab when tilting it up.

    • Be sure to have 2 people tilt the cab up when a heavy object such as a roof rack or cargo carrier is installed to the cab.

    • Be sure to remove anything set on top of the cab before tilting it up.

    • Make sure that the cab is securely locked in place after it is tilted up.

    • Make sure that there are no tools, cloths, etc. left in the engine room before tilting the cab back down.

    • Make sure that the cab is securely locked in place after tilting it back down.

  2. INSPECT FOR COOLANT LEAK

    CAUTION:

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

    Note

    Before each inspection, turn the A/C switch off.


    1. Fill the radiator with coolant and attach a radiator cap tester.

    2. Warm up the engine.

    3. Using the radiator cap tester, increase the pressure inside the radiator to 137 kPa (1.4 kgf/cm2, 20 psi), and check that the pressure does not drop.

      If the pressure drops, check the hoses, radiator assembly and engine water pump for leaks. If no external leaks are found, check the heater core, cylinder block and cylinder head.

  3. INSPECT ENGINE COOLANT LEVEL


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

      If the engine coolant level is low, 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 to the F line.

      Note

      Do not substitute plain water for engine coolant.

  4. INSPECT ENGINE COOLANT QUALITY


    1. Remove the radiator cap sub-assembly.

      CAUTION:

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

    2. Check if there are any excessive deposits of rust or scales around the radiator cap sub-assembly and radiator filler hole. Also, the coolant should be free of oil.

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

    3. Install the radiator cap sub-assembly.