REPLACEMENT

CAUTION / NOTICE / HINT

CAUTION:

Do not remove the radiator cap sub-assembly or radiator drain cock plug while the engine and radiator assembly are still hot. Pressurized, hot engine coolant and steam may be released and cause serious burns.

PROCEDURE

1. DRAIN ENGINE COOLANT (for Engine)

CAUTION:

Do not remove the radiator cap sub-assembly or radiator drain cock plug while the engine and radiator assembly are still hot. Pressurized, hot engine coolant and steam may be released and cause serious burns.

(a) Remove the 2 screws and clip.

(b) Pull down the No. 1 engine under cover.

NOTICE:

Do not damage the No. 1 engine under cover.

(c) Connect a hose with an inside diameter of 8.3 mm (0.327 in.) to the radiator drain cock as shown in the illustration.

*1 No. 1 Engine Under Cover *a Hose

(d) Loosen the radiator drain cock plug.

(e) Remove the radiator cap sub-assembly. Then drain the engine coolant.

HINT:

Collect the engine coolant in a container and dispose of it according to the regulations in your area.

(f) Tighten the radiator drain cock plug by hand.

(g) Disconnect the hose from the radiator drain cock.

(h) Install the 2 screws and clip.

2. ADD ENGINE COOLANT (for Engine)

(a) Slowly fill the radiator assembly with engine coolant.

Specified Capacity:

6.1 liters (6.4 US qts, 5.4 Imp. qts)

NOTICE:

Do not substitute plain water for engine coolant.

HINT:

TOYOTA vehicles are filled with TOYOTA SLLC at the factory. In order to avoid damaging the engine cooling system and other technical problems, only use TOYOTA SLLC or similar high quality ethylene glycol based non-silicate, non-amine, non-nitrite, 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).

(b) Remove the reserve tank cap. [*1]

(c) Slowly pour engine coolant into the radiator reserve tank assembly until it reaches the F line. [*2] NOTICE: Do not substitute plain water for engine coolant.

*a F Line *b L Line

(d) Squeeze the No. 1 radiator hose and No. 2 radiator hose several times by hand, and then check the level of the engine coolant.

If the engine coolant level is below the F line, add engine coolant.

(e) Install the radiator cap sub-assembly.

(f) Install the reserve tank cap. [*3]

(g) Perform the following procedure to set the engine to engine coolant filling mode. [*4]

HINT:

It is necessary to set the engine to engine coolant filling mode to ensure that a certain engine water pump assembly (water inlet housing) speed is maintained in order to circulate engine coolant.

(1) Move the shift lever to P.

(2) Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility

(3) Start the engine.

(4) Run the engine at 1500 rpm or more for 15 seconds or more.

(5) Check that the speed of the electric water pump increases when the engine is raced to 2500 rpm.

Powertrain > Engine > Data List

Standard:

NOTICE:

Do not move the shift lever from P, or engine coolant filling mode will be canceled.

HINT:

The speed of the engine water pump assembly (water inlet housing) changes in accordance with the engine speed when the engine is being raced in engine coolant filling mode.

(h) Run the engine at 2500 rpm for 10 seconds and then idle the engine for 10 seconds. (Repeat this step at least 3 times.) [*5]

(i) Warm up the engine until the water inlet with thermostat sub-assembly opens. While the water inlet with thermostat sub-assembly is open, circulate the engine coolant for several minutes. [*6]

HINT:

The water inlet with thermostat sub-assembly open timing can be confirmed by squeezing the No. 2 radiator hose by hand, and sensing vibrations when the engine coolant starts to flow inside the No. 2 radiator hose.

(j) Wait until the engine coolant cools down. [*7]

(k) Check that the engine coolant level is between the F line and L line. [*8]

3. INSPECT FOR COOLANT LEAK (for Engine)

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