COOLING SYSTEM GENERAL GENERAL

  1. OUTLINE

    1. The cooling system uses a pressurized forced circulation system.

    2. The engine water pump assembly is used on the timing chain or belt cover sub-assembly.

    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 with motor assembly to prevent throttle body with motor assembly icing (ice buildup). At the same time, warm water from the cylinder head sub-assembly is also sent to the EGR valve assembly to cool it down.

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

      W140064C01

      *1

      EGR Cooler Assembly

      *2

      EGR Valve Assembly

      *3

      Throttle Body with Motor Assembly

      *4

      Thermostat

      *5

      Engine Water Pump Assembly

      -

      -

      *a

      from Heater Radiator Unit Sub-assembly

      *b

      to Heater Core Radiator Unit Sub-assembly

      *c

      from Radiator Assembly

      *d

      to Radiator 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
        Tip:

        *: 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)