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Hybrid Transaxle: Coolant: Replacement

  1. REMOVE ENGINE UNDER COVER NO. 1 (See  REMOVAL  ) 
  2. REMOVE ENGINE UNDER COVER NO. 2 (See step 12 in  REMOVAL  ) 
  3. REMOVE ENGINE ROOM SIDE LH COVER (See  REMOVAL  ) 
  4. DRAIN COOLANT 
    1. Remove the transaxle side reserve tank.
      NOTE: Do not remove the reserve tank cap when the engine is hot.
    2. Loosen the bleeder plug shown in the illustration and drain the coolant.
    3. Close the bleeder plug.
      Fig 1: Identifying Bleeder Plug
      G04112649Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Remove the plug and gasket shown in the illustration and drain the coolant.
    5. Install the plug with a new gasket.

      Torque: 39 N*m (398 kgf*cm, 29 ft.*lbf) 

      Fig 2: Identifying Plug
      G04112650Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. ADD COOLANT 
    1. Loosen the bleeder plug shown in the illustration and connect a hose.
      NOTE: Insert one end of the hose into the reserve tank.
    2. Add coolant from the reserve tank.
      Fig 3: Identifying Bleeder Plug
      G04112651Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Add coolant until the level of coolant in the hose attached to the bleeder plug reaches the same level as the FULL line of the reserve tank.

      Coolant quantity: 3.4 L (3.6 US qts, 3.0 Imp. qts.) 

      Fig 4: Adding Coolant
      G04112652Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. When using the intelligent tester:
      1. Connect the intelligent tester to the DLC3.
      2. Turn the ignition switch to the ON position.
      3. On the tester, enter the following menus: DIAGNOSIS / OBD/MOBD / HV ECU / ACTIVE TEST / WATER PUMP.
      4. Keep the coolant at the FULL level in the reserve tank to compensate for the drop in coolant level when the air bleeds.
        Fig 5: Connecting Intelligent Tester To DLC3
        G04111596Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

        HINT:

        Loud noise made by the water pump and poor circulation of coolant in the reserve tank indicates that there is air in the coolant system.

    5. When not using the intelligent tester:
      1. Put the vehicle into the READY-on state. [*1]
      2. Turn the ignition switch off and add coolant to the FULL level because the coolant level drops as the air bleeds. [*2]
        NOTE:
        • Be sure to turn the ignition switch off before adding SLLC.
        • Do not work on the components in the engine compartment while the vehicle is in the READY-on state because the engine is in intermittent operation.
      3. Repeat steps [*1] and [*2] until air bleeding from the coolant system is completed.

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

        HINT:

        Loud noise made by the water pump and poor circulation of coolant in the reserve tank indicates that there is air in the coolant system.

    6. When the air is completely bled from the coolant system, tighten the plug.
    7. Add coolant to the FULL mark of the reserve tank.
    Fig 6: Identifying Coolant Level At FULL Mark Of Reserve Tank
    G04112654Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. CHECK FOR COOLANT LEAKS 
  7. INSTALL ENGINE ROOM SIDE LH COVER (See step 125 in  INSTALLATION  ) 
  8. INSTALL ENGINE UNDER COVER NO. 2 (See step 112 in  INSTALLATION  ) 
  9. INSTALL ENGINE UNDER COVER NO. 1 (See step 117 in  INSTALLATION  ) 
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