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Home >> Lexus >> 2025 >> NX 250 FWD >> Repair and Diagnosis >> Transmission >> Transmission Control Systems >> Automatic Transaxle System - Service Information (1 Of 4) >> Oil Cooler >> Installation [11/2021 - ] >> Procedure

Installation [11/2021 - ]: Procedure

  1. INSTALL TRANSMISSION OIL COOLER 
    1. Fig 1: Transmission Oil Cooler Bolts Tightening Sequence
      GTY1060394Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Temporarily Tighten - -
      1. Install the transmission oil cooler to the automatic transaxle case sub-assembly with the 3 bolts in the order shown in the illustration.

        Torque: 13.5 N.m (138 kgf/cm, 10 ft.lbf) 

  2. CONNECT WATER BY-PASS HOSE ASSEMBLY 
    1. GTY1059905Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a 2 to 7 mm (0.0787 to 0.276 in.) *b Paint Mark
      *c 45° (Claw of Clip Location) - -
      1. Connect the water by-pass hose assembly to the transmission oil cooler and slide the clip to secure it.
        NOTE:
        • Make sure to slide the water by-pass hose assembly until it contacts the hose stopper of the transmission oil cooler.
        • Make sure to align the paint mark of the water by-pass hose assembly with the paint mark of the transmission oil cooler.
        • Make sure that the claws of the clip are within the location shown in the illustration.
  3. CONNECT NO. 1 WATER BY-PASS HOSE 
    1. GTY1062317Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a 2 to 7 mm (0.0787 to 0.276 in.) *b Paint Mark
      *c 45° (Claw of Clip Location) - -
      1. Connect the No. 1 water by-pass hose to the transmission oil cooler and slide the clip to secure it.
        NOTE:
        • Make sure to slide the No. 1 water by-pass hose until it contacts the hose stopper of the transmission oil cooler.
        • Make sure to align the paint mark of the No. 1 water by-pass hose with the paint mark of the transmission oil cooler.
        • Make sure that the claws of the clip are within the location shown in the illustration.
      2. Engage the 3 clamps to install the transmission breather clamp.
  4. INSTALL NO. 1 OIL COOLER TUBE SUB-ASSEMBLY WITHOUT HOSE 
    1. GTY1064873Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 1 Oil Cooler Tube Sub-assembly without Hose *2 Inlet No. 1 Oil Cooler Hose
      *3 Inlet No. 2 Oil Cooler Hose *4 Outlet No. 1 Oil Cooler Hose
      *5 Outlet No. 2 Oil Cooler Hose - -
      *a 2 to 7 mm (0.0787 to 0.276 in.) *b 45° (Claw of Clip Location)
      *c 0 to 3 mm (0 to 0.118 in.) *d 135° (Claw of Clip Location)
      1. Install the inlet No. 1 oil cooler hose, inlet No. 2 oil cooler hose, outlet No. 1 oil cooler hose and outlet No. 2 oil cooler hose to the No. 1 oil cooler tube sub-assembly without hose and slide the 4 clips to secure them.
        NOTE:
        • Make sure to slide the inlet No. 1 oil cooler hose, inlet No. 2 oil cooler hose, outlet No. 1 oil cooler hose and outlet No. 2 oil cooler hose until each contacts the hose stopper of the No. 1 oil cooler tube sub-assembly without hose.
        • Make sure that the claws of each clip are within the location shown in the illustration.
    2. GTY1065555Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a 0 to 3 mm (0 to 0.118 in.) *b 2 to 7 mm (0.0787 to 0.276 in.)
      *c Paint Mark *d 45° (Claw of Clip Location)
      *e Torque Wrench Fulcrum Length *f Bolt (A)
      *g Bolt (B) - -
      1. Connect the outlet No. 2 oil cooler hose to the transmission oil cooler and slide the clip to secure it.
        NOTE:
        • Make sure to slide the outlet No. 2 oil cooler hose until it contacts the hose stopper of the transmission oil cooler.
        • Make sure to align the paint mark of the outlet No. 2 oil cooler hose with the paint mark of the transmission oil cooler.
        • Make sure that the claws of the clip are within the location shown in the illustration.
      2. Connect the inlet No. 2 oil cooler hose to the transmission oil cooler and slide the clip to secure it.
        NOTE:
        • Make sure to slide the inlet No. 2 oil cooler hose until it contacts the hose stopper of the transmission oil cooler.
        • Make sure to align the paint mark of the inlet No. 2 oil cooler hose with the paint mark of the transmission oil cooler.
        • Make sure that the claws of the clip are within the location shown in the illustration.
      3. Temporarily install the No. 1 oil cooler tube sub-assembly without hose to the automatic transaxle case sub-assembly with the 2 bolts.
      4. Using SST, tighten the bolt (A).
        • SST: 09961-00950 

        Specified tightening torque 

        Torque: 13.5 N.m (138 kgf/cm, 10 ft.lbf) 

        HINT: 

        • Calculate the torque wrench reading when changing the fulcrum length of the torque wrench.

          Refer to PRECAUTION [11/2021 - ]

        • When using SST (fulcrum length of 150 mm (5.91 in.)) + torque wrench (fulcrum length of 162 mm (6.38 in.)):

          7.0 N.m (71 kgf/cm, 62 in.lbf)

      5. Tighten the bolt (B).

        Torque: 13.5 N.m (138 kgf/cm, 10 ft.lbf) 

  5. CONNECT INLET NO. 1 OIL COOLER HOSE 
    1. GTY1062841Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a 0 to 3 mm (0 to 0.118 in.) *b 2 to 7 mm (0.0787 to 0.276 in.)
      1. Connect the inlet No. 1 oil cooler hose to the No. 1 oil cooler outlet tube sub-assembly and slide the clip to secure it.
        NOTE:

        Make sure to slide the inlet No. 1 oil cooler hose until it contacts the hose stopper of the No. 1 oil cooler outlet tube sub-assembly.

  6. CONNECT OUTLET NO. 1 OIL COOLER HOSE 
    1. GTY1060461Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a 0 to 3 mm (0 to 0.118 in.) *b 2 to 7 mm (0.0787 to 0.276 in.)
      *c Paint Mark (Left Side of Vehicle) *d 30° (Paint Mark Location)
      1. Connect the outlet No. 1 oil cooler hose to the oil cooler union sub-assembly and slide the clip to secure it.
        NOTE:
        • Make sure to slide the outlet No. 1 oil cooler hose until it contacts the hose stopper of the oil cooler union sub-assembly.
        • Make sure that the paint mark of the outlet No. 1 oil cooler hose is within the location shown in the illustration.
  7. INSTALL BATTERY CLAMP SUB-ASSEMBLY 

    Refer to PROCEDURE - Step 42

  8. INSTALL ECM 

    Refer to INSTALLATION [11/2021 - ]

  9. INSTALL BATTERY 

    Refer to INSTALLATION [11/2021 - ]

  10. ADD ENGINE COOLANT 

    Refer to PROCEDURE - Step 5

  11. ADJUST AUTOMATIC TRANSAXLE FLUID 

    Refer to ADJUSTMENT [11/2021 - ] 

  12. INSPECT FOR OIL LEAK 
  13. INSPECT FOR COOLANT LEAK 

    Refer to PROCEDURE - Step 1

  14. INSTALL FRONT FENDER APRON SEAL LH 

    Refer to PROCEDURE - Step 70

  15. INSTALL NO. 2 ENGINE UNDER COVER ASSEMBLY 

    Refer to PROCEDURE - Step 72

  16. INSTALL NO. 1 ENGINE UNDER COVER 

    Refer to PROCEDURE - Step 73

  17. INSTALL FRONT FENDER FRONT SPLASH SHIELD RH 
  18. INSTALL FRONT FENDER FRONT SPLASH SHIELD LH