Lexus NX: Replacement

REPLACEMENT

PROCEDURE

1. REMOVE NO. 1 ENGINE UNDER COVER

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2. DRAIN COOLANT (for Inverter Coolant)

NOTICE:

Collect the drained coolant and measure its volume to establish a benchmark. When adding coolant, make sure to add more coolant than the measured amount.

(a) Remove the inverter reserve tank cap.

CAUTION:

To avoid the danger of being burned, do not remove the inverter reserve tank cap while the coolant for the inverter is still hot.

(b) Using a 10 mm hexagon wrench, remove the drain plug at the position shown in the illustration, and drain the coolant. CAUTION: Use caution when handling coolant immediately after driving or in summer because it may be hot.

(c) Install the drain plug with a new gasket.

Torque:

39.2 N·m {400 kgf·cm, 29 ft·lbf}

(d) Measure the volume of coolant discharged from the drain.

3. ADD COOLANT (for Inverter Coolant)

NOTICE:

If the vehicle is driven with air in the coolant system, damage may occur and the following DTCs may be stored.

(a) Slowly pour coolant into the inverter reserve tank until it reaches the FULL line.

NOTICE:

To prevent foreign matter such as dust or dirt from entering the cooling system, make sure to confirm that the container used to add coolant is clean and free of foreign matter such as dust or dirt.

Standard Capacity:

3.1 liters (3.3 US qts, 2.7 Imp. qts.)

(b) When using the Techstream:

(1) Connect the Techstream to the DLC3.

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

(3) Enter the following menus: Powertrain / Hybrid Control / Active Test / Activate the (Inverter) Water Pump.

(4) Keep the coolant at the FULL line in the inverter reserve tank to compensate for the drop in coolant level when the air bleeds.

Standard:

Air bleeding from the inverter cooling system is completed when the noise made by the inverter water pump assembly becomes smaller and the circulation of coolant in the reserve tank improves.

(c) When not using the Techstream:

(1) Turn the power switch on (READY). [*1]

(2) Turn the power switch off and add coolant to the FULL line because the coolant level drops as the air bleeds. [*2]

(3) Repeat steps [*1] and [*2] until air bleeding from the cooling system is completed.

Standard:

Air bleeding from the inverter cooling system is completed when the noise made by the inverter water pump assembly becomes smaller and the circulation of coolant in the inverter reserve tank improves.

HINT:

A loud noise made by the inverter water pump assembly and poor circulation of coolant in the inverter reserve tank indicates that there is air in the cooling system.

(d) After the air is completely bled from the cooling system, add coolant to the FULL line of the inverter reserve tank.

NOTICE:

Collect the drained coolant and measure its volume to establish a benchmark. When adding coolant, make sure to add more coolant than the measured amount.

(e) Tighten the inverter reserve tank cap.

4. INSPECT FOR COOLANT LEAK (for Inverter Coolant)

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5. INSTALL NO. 1 ENGINE UNDER COVER

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