COOLING SYSTEM


  1. OUTLINE


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

    2. A thermostat with a bypass valve is located in the water inlet housing to maintain a suitable temperature in the cooling system.

    3. The flow of the coolant makes a U-turn in the cylinder block sub-assembly to ensure smooth flow. In addition, a bypass passage is enclosed in the cylinder head sub-assembly and the cylinder block sub-assembly.

    4. Warm coolant from the cylinder head sub-assembly is sent to the throttle body assembly to prevent throttle body assembly icing (ice buildup).

    5. The engine coolant used is TOYOTA genuine Super Long Life Coolant (SLLC).

      A001N4DC01
      *1 Engine Water Pump Assembly *2 Throttle Body Assembly
      *3 Transmission Oil Cooler *4 Thermostat
      *a From Radiator Assembly *b To Radiator Assembly
      *c To Heater Radiator Unit Sub-assembly *d From Heater Radiator Unit Sub-assembly

  2. SPECIFICATION


    1. Engine Coolant


      1. TOYOTA genuine Super Long Life Coolant (SLLC) is used. The 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.

        Type TOYOTA Genuine SLLC or 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 78 to 82°C (172.4 to 179.6°F)