COOLING SYSTEM > GENERAL



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 engine water pump assembly, reducing friction losses and 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 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. TOYOTA genuine Super Long Life Coolant (SLLC) is used.
    *: Models with exhaust heat recirculation system


    W103136E01


    Text in Illustration 
    *A
    		Models with Exhaust Heat Recirculation System
    		-
    		-
    *1
    		Reservoir Tank
    		*2
    		Engine Water Pump Assembly
    *3
    		Throttle Body Assembly
    		*4
    		EGR Valve Assembly
    *5
    		EGR Cooler
    		*6
    		Thermostat
    *a
    		From Heater Radiator Unit Sub-assembly
    		*b
    		To Heater Radiator Unit Sub-assembly
    *c
    		From Exhaust Heat Recirculation System
    		*d
    		To Exhaust Heat Recirculation System
    *e
    		To Radiator Assembly
    		*f
    		From Radiator Assembly


SPECIFICATION

  1. Engine Coolant

    1. TOYOTA genuine SLLC is used. The maintenance interval is as shown in the table below:

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

      HINT:
      *: 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. SLLC is pre-mixed (50 % coolant and 50 % deionized water), so no dilution is needed when adding or replacing SLLC.

  2. Thermostat

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