Replacement [12/2017 - ]: Procedure

1. for 2WD:
   1. Remove the 3 screws, clip and disconnect the No. 1 engine under cover assembly.

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      	Screw
      	Clip
      	Disconnect in this Direction

2. for AWD:
   1. Remove the 2 screws, clip and disconnect the No. 1 engine under cover assembly.

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      	Screw
      	Clip
      	Disconnect in this Direction

Refer to PROCEDURE - Step 7

Refer to PROCEDURE - Step 3

Refer to PROCEDURE - Step 11 [12/2017 - 09/2018] , or refer to PROCEDURE - Step 11 [09/2018 - 10/2020] , or refer to PROCEDURE - Step 11 [10/2020 - 10/2022] , or refer to PROCEDURE - Step 11 [10/2022 - 10/2023] , or refer to PROCEDURE - Step 11 [10/2023 - ]

Refer to PROCEDURE - Step 2

Refer to PROCEDURE - Step 1

Refer to PROCEDURE - Step 3

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a

   Hose

2. Connect a hose with an inside diameter of 8 mm (0.315 in.) to the cylinder block water drain cock plug (for Bank 1) as shown in the illustration.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a

   Hose

3. Loosen the radiator drain cock plug.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1	Radiator Drain Cock Plug	*2	Water Filler Cap Sub-assembly
   *3	Radiator Reserve Tank Assembly	*4	Reserve Tank Cap
   *5	Cylinder Block Water Drain Cock Plug	*6	No. 1 Radiator Hose
   *7	No. 3 Radiator Hose	-	-

4. 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.

5. Loosen the cylinder block drain cock plug (for Bank 1).
6. Tighten the cylinder block drain cock plug (for Bank 1).

   Torque: 12.7 N.m (130 kgf/cm, 9 ft.lbf) 

7. Tighten the radiator drain cock plug by hand.
8. Disconnect the hose from the cylinder block water drain cock plug (for Bank 1).
9. Disconnect the hose from the radiator drain cock.

HINT: 

Before adding coolant, turn the A/C switch off.

1. Remove the water filler cap sub-assembly and reserve tank cap.
2. Using a 6 mm hexagon socket wrench, loosen the air drain cock plug.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1	Air Drain Cock Plug

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a

   Air Hose

4. Pull out the air hose to the top of the vehicle as shown in the illustration.
5. Add engine coolant to the radiator reserve tank assembly until engine coolant overflows from the air drain cock hole. Then using a 6 mm hexagon socket wrench, tighten the air drain cock plug.

   Torque: 1.5 N.m (15 kgf/cm, 13 in.lbf) 

6. Add engine coolant to the level shown in the illustration.

   Specified Capacity

   Item	Specified Condition
   for 2WD	10.6 liters (11.2 US qts, 9.3 Imp. qts)
   for AWD	10.5 liters (11.1 US qts, 9.2 Imp. qts)

   NOTE:

   Do not substitute plain water for engine coolant.

   HINT: 

   LEXUS 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).

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

7. Squeeze the No. 1 radiator hose and No. 3 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.

8. Install the reserve tank cap.
9. Disconnect the air hose from the air drain cock.
10. Pour coolant of the specified concentration into the coolant filler hole on the engine side until the coolant level reaches the hole, and then install the water filler cap sub-assembly.
11. Bleed air from the cooling system.
    NOTE:

    • Before starting the engine, turn the A/C switch off.
    • Adjust the heater control to the maximum hot setting.
    • Adjust the blower speed to the low setting.
    1. Start the engine and with the shift lever in P and the engine speed at 1500 rpm or more continuously for 5 seconds or more, switch the water control valve to injection control and warm the engine.
    2. Squeeze the No. 1 radiator hose and No. 3 radiator hose several times by hand to bleed air.
       WARNING:

       • Because the engine, radiator assembly, No. 1 radiator hose and No. 3 radiator hose are extremely hot, do not perform these procedures without wearing protective gloves.
       • Performing these procedures without wearing protective gloves could result in burns.
       • Touching rotating components such as the cooling fan could result in your hand or clothing getting caught and pulled in.
       NOTE:

       • Make sure that the radiator reserve tank assembly still has some engine coolant in it.
       • If the engine coolant temperature gauge indicates an excessive temperature, turn off the engine and let it cool.
       • If there is not enough engine coolant, the engine may overheat or be seriously damaged.
       • If the radiator reserve tank assembly does not have enough engine coolant, perform the following: 1) stop the engine, 2) wait until the engine coolant cools down, and 3) add engine coolant until the radiator reserve tank assembly is filled to the full line.
12. Stop the engine, and wait until the engine coolant cools down.
13. Remove the reserve tank cap and check the engine coolant level.

    If the engine coolant level is low, add engine coolant.

14. Add engine coolant to the F line on the radiator reserve tank assembly.

Refer to PROCEDURE - Step 3

Refer to PROCEDURE - Step 8

Refer to PROCEDURE - Step 9

Refer to PROCEDURE - Step 10

Refer to PROCEDURE - Step 192 [12/2017 - 09/2018] , or refer to PROCEDURE - Step 192 [09/2018 - 10/2020] , or refer to PROCEDURE - Step 193 [10/2020 - 10/2023] , or refer to PROCEDURE - Step 192 [10/2023 - ]

Refer to PROCEDURE - Step 17

Refer to PROCEDURE - Step 6

1. for 2WD:
   1. Install the 3 screws and clip to connect the No. 1 engine under cover assembly.

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      	Screw
      	Clip

2. for AWD:
   1. Install the 2 screws and clip to connect the No. 1 engine under cover assembly.

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      	Screw
      	Clip