COOLING SYSTEM GENERAL


  1. OUTLINE


    1. The cooling system uses a pressurized forced circulation system with pressurized reservoir tank.

    2. The drive belt and pulley have been discontinued by providing an electric water pump, reducing the friction loss and reducing the weight.

    3. A thermostat is located on the water inlet housing to maintain suitable temperature distribution in the cooling system.

    4. Warm water from the cylinder head sub-assembly is sent to the throttle body to prevent the throttle body icing (ice buildup), and at the same time is also sent to the EGR cooler to cool down the EGR gas.

    5. An exhaust heat recirculation system that collects exhaust heat from the exhaust system has been provided.

    6. An aluminum radiator core is used for weight reduction.

    7. The engine coolant uses TOYOTA genuine SLLC (Super Long Life Coolant).

      A01J7SSE01
      Text in Illustration
      *1 Reservoir Tank *2 Water Pump Assembly
      *3 Throttle Body Assembly *4 EGR Valve Assembly
      *5 EGR Cooler *6 From Heater Core
      *7 To Heater Core *8 From Exhaust Heat Recirculation System
      *9 To Exhaust Heat Recirculation System *10 To Radiator Assembly
      *11 From Radiator Assembly - -

  2. SPECIFICATION


    1. Engine Coolant


      1. TOYOTA genuine SLLC (Super Long Life Coolant) is used. Maintenance interval is as shown in the table below.

      2. SLLC is pre-mixed (50 % coolant and 50 % deionized water), so no dilution is needed when adding or replacing SLLC in the vehicle.

        Type TOYOTA Genuine SLLC or the equivalent*
        Maintenance Intervals First Time 160000 km (100000 miles)
        Subsequent Every 80000 km (50000 miles)
        Color Pink

        Tech Tips

        *: 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.)

    2. Thermostat

      Thermostat Opening Temperature 80 to 84°C (176 to 183°F)