COOLING SYSTEM


  1. OUTLINE


    1. The cooling system is a pressurized, forced-circulation type.

    2. Toyota Genuine Super Long Life Coolant (SLLC) is used.

    3. 3 thermostats are used to improve cooling and warm-up performance.

      Thermostat Installation Position Objective
      Thermostat Water Inlet Controls the engine coolant flow rate from the radiator.
      Thermostat (Cylinder Block Side) Cylinder Block Sub-assembly Controls the engine coolant flow rate to the cylinder block sub-assembly during warm-up to shorten the time required to warm-up the engine and achieve low fuel consumption.
      Manifold Thermostat Water Hose of Throttle Body Assembly Reduces the engine coolant flow rate to the throttle body assembly when the coolant temperature is high to suppress increases in intake air temperature.

    4. A direct coolant path is provided in the engine side module (water inlet housing) to the cylinder head sub-assembly and cylinder block sub-assembly and the distribution of engine coolant is optimized to prevent extreme increases in the temperature around the combustion chambers of the cylinder head sub-assembly and cylinder block sub-assembly when the thermostat (cylinder block side) installed in the cylinder block sub-assembly is closed.

    5. A bleeder valve is provided in the No. 3 water by-pass pipe and water hose sub-assembly to shorten the work time required when replacing engine coolant.

  2. SPECIFICATION


    1. Engine Coolant


      1. Toyota Genuine SLLC is used. The maintenance intervals are as shown in the table below:

        Engine Coolant Type Toyota Genuine 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 (coolant with long-life hybrid organic acid technology is a combination of low phosphates and organic acids). Do not use plain water alone.
        Color Pink
        Maintenance Intervals First Time 100000 miles (160000 km)
        Subsequent Every 50000 miles (80000 km)

        Tech Tips

        SLLC is pre-mixed (50% coolant and 50% deionized water). Therefore, no dilution is needed when SLLC in the vehicle is added or replaced.

    2. Thermostat

      Thermostat Thermostat Opening Temperature Thermostat Closing Temperature
      Thermostat 82°C (180°F) -
      Thermostat (Cylinder Block Side) 78°C (172°F) -
      Manifold Thermostat - 83°C (181°F)