The cooling system is a pressurized, forced-circulation type.
A thermostat with a bypass valve is located on the water inlet housing to maintain suitable temperature distribution in the cooling system. This prevents sudden jumps in temperature while the engine is warming up.
A water pump swirl chamber is placed in the timing chain cover to achieve a simpler construction and a more compact engine.
An aluminum radiator core is used for weight reduction.
A water-cooled oil cooler assembly and a water-cooled EGR cooler are provided.
Toyota Genuine Super Long Life Coolant (SLLC) is used.
Toyota Genuine SLLC is used. Maintenance interval is 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.|
|Maintenance Intervals||First Time||160000 km (100000 miles)|
|Subsequent||Every 80000 km (50000 miles)|
SLLC is pre-mixed (50% coolant and 50% deionized water), so no dilution is needed when adding or replacing SLLC in the vehicle.
|Thermostat Opening Temperature||80°C to 84°C (176°F to 183°F)|