Cooling System On-Vehicle Inspection


  1. INSPECT FOR COOLANT LEAK

  2. INSPECT RESERVOIR TANK ENGINE COOLANT LEVEL

  3. INSPECT ENGINE COOLANT QUALITY

Cooling System -- On-Vehicle Inspection



1. INSPECT FOR COOLANT LEAK
CAUTION:
To avoid being burned, do not remove the radiator cap sub-assembly while the engine and radiator assembly are still hot. Thermal expansion may cause hot engine coolant and steam to blow out from the radiator assembly.

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

  1. Warm up the engine.

  1. Using the radiator cap tester, increase the pressure inside the radiator assembly to 123 kPa (1.3 kgf/cm2, 18 psi), and then check that the pressure does not drop.
    If the pressure drops, check the hose, radiator assembly and engine water pump assembly for leakage. If no external leakage is found, check the heater core, cylinder block and cylinder head.



2. INSPECT RESERVOIR TANK ENGINE COOLANT LEVEL

  1. The engine coolant should be between the LOW and FULL lines when the engine is cold.
    If the engine coolant is below the LOW line, check for leakage and add TOYOTA Super Long Life Coolant (SLLC) or similar high quality ethylene glycol based non-silicate, non-amine, non-nitrite, non-borate coolant with long-life hybrid organic acid technology to the FULL line.



3. INSPECT ENGINE COOLANT QUALITY
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. Fluid and steam could be blown out under pressure.

  1. Remove the radiator cap sub-assembly.

  1. Check for excessive deposits of rust or scales around the radiator reservoir cap and radiator reservoir filler hole. Also, the engine coolant should be free of oil.
    If excessively dirty, replace the engine coolant.

  1. Install the radiator cap sub-assembly.