REPLACEMENT

CAUTION / NOTICE / HINT

CAUTION:

Do not remove the reserve tank cap, air release valve 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 reserve tank cap, air release valve 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 3 clips and 2 bolts.

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

NOTICE:

Do not damage the No. 1 engine under cover assembly.

(c) Connect a hose with an inside diameter of 9 mm (0.354 in.) to the radiator drain cock as shown in the illustration.

*a Hose

(d) Loosen the radiator drain cock plug.

*1 Reserve Tank Cap *2 Radiator Drain Cock Plug *a Air Release Valve

(e) Remove the reserve tank cap. 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 3 clips.

(i) Install the bolt.

Torque:

7.5 N·m {76 kgf·cm, 66 in·lbf}

2. ADD ENGINE COOLANT (for Engine)

(a) Using a 6 mm hexagon socket wrench, remove the air release valve from the radiator reserve tank assembly.

*a Air Release Valve

(b) Add coolant to the level shown in the illustration. Specified Capacity: 5.4 liters (5.7 US qts, 4.8 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).

(c) 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 low, add engine coolant.

(d) Using a 6 mm hexagon socket wrench, install the air release valve to the radiator reserve tank assembly.

Torque:

2.0 N·m {20 kgf·cm, 18 in·lbf}

(e) Install the reserve tank cap.

NOTICE:

Securely tighten the reserve tank cap as much as possible.

(f) Put the engine in inspection mode (maintenance mode).

(1) Connect the GTS to the DLC3.

(2) Turn the power switch on (IG).

(3) Turn the GTS on.

(4) Enter following menus: Powertrain / Hybrid Control / Utility / Inspection Mode.

Powertrain > Hybrid Control > Utility

(g) Bleed air from the cooling system.

(1) 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.

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.

(2) Squeeze the No. 1 radiator hose and No. 2 radiator hose several times by hand to bleed air from the system.

When squeezing the No. 1 radiator hose and No. 2 radiator hose:

HINT:

If the flowing sound of engine coolant can still be heard after bleeding air, perform the following procedure to bleed air again.

(h) After the engine has cooled down, check that the engine coolant level is between the FULL line and LOW line. NOTICE: The coolant levels in the compartments inside the radiator reserve tank assembly may differ, but this is not a malfunction. If the engine coolant level is below the LOW line, add engine coolant to the FULL line.

*a FULL Line *b LOW Line

3. INSPECT FOR COOLANT LEAK (for Engine)

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