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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 609 (Automatic Transmission) >> Basic Inspection >> CVT Fluid Cooler System >> CVT Fluid Cooler Flush >> CVT Fluid Cooler Cleaning Procedure

CVT Fluid Cooler Cleaning Procedure

WARNING: This page is about a different car, the 2020 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove front under cover. Refer to Removal and Installation .
  2. Remove front left wheel and tire using power tool. Refer to Adjustment .
  3. Partially remove front fender protector (LH). Refer to Exploded View .
  4. Position an oil drain pan under the CVT fluid cooler (auxiliary).
  5. Remove bolts (A, B) and disconnect the CVT fluid cooler (auxiliary) bypass valve (1) from the CVT fluid cooler (auxiliary).
    GNSALDIA0892Z-892Courtesy of NISSAN NORTH AMERICA, INC.
  6. Position an oil drain pan under the CVT oil warmer.
  7. Disconnect the CVT fluid cooler hose A and CVT fluid cooler hose D from the CVT oil warmer. Refer to Exploded View .
    CAUTION: Do not reuse hose clamps.
    NOTE:
    • If rubber material from cooler hose remains on the steel tube or fitting, clean steel tube and replace rubber hose.
    • The hoses removed from the CVT fluid warmer will be flushed first in one direction and then the other.
  8. Allow any transmission fluid that remains in the CVT fluid cooler hoses to drain into the oil drain pan.
  9. Flush CVT fluid cooler (radiator) and hoses using the following steps:
    1. Attach a suitable hose (A) to the CVT fluid cooler hose (1).
      GNSALDIA0893Z-893Courtesy of NISSAN NORTH AMERICA, INC.

      Hose inside diameter

      : 16 mm (5/8 in)
    2. Insert extension adapter hose (B) from a can of Transmission Cooler Cleaner, into CVT fluid cooler hose (2).
      CAUTION:
      • Wear safety glasses and rubber gloves when spraying the Transmission Cooler Cleaner.
      • Spray Cooler Cleaner only in areas with adequate ventilation.
      • Avoid contact with eyes and skin.
      • Do not breathe vapors or mist from spray.
      NOTE: Always check with the Parts Department for latest parts information.
    3. Block the CVT fluid cooler (auxiliary) bypass valve fluid passage (A).
      GNSDB118232Courtesy of NISSAN NORTH AMERICA, INC.
    4. Holding the can and hose as high as possible, spray Transmission Cooler Cleaner in a continuous stream into the CVT fluid cooler (radiator) inlet side hose until it flows from the outlet side hose for five seconds.
  10. Attach a suitable hose over the end of the CVT fluid cooler hose (2) that was used as the flush inlet.
    GNSDB113950Courtesy of NISSAN NORTH AMERICA, INC.

    Hose inside diameter

    : 16 mm (5/8 in)
  11. Blow compressed air through CVT fluid cooler hose (2) for 10 seconds to force remaining fluid out of CVT fluid cooler hose (1).

    Air pressure

    : 490-883 kPa (5-9 kg/cm 2 , 70-128 psi)
    NOTE: Block CVT fluid cooler (auxiliary) bypass valve fluid passage (A) when blowing compressed air through the CVT fluid cooler hose.
    GNSDB118232Courtesy of NISSAN NORTH AMERICA, INC.
  12. Repeat steps 9-11 one additional time, then proceed to step 13.
  13. Reverse flush the CVT fluid cooler. Install Transmission Cooler Cleaner to CVT fluid cooler hose (1), then reverse flush CVT fluid cooler by repeating steps 9-11 twice.
  14. Remove CVT fluid cooler (auxiliary). Refer to Removal and Installation .
  15. Remove O-rings from CVT fluid cooler (auxiliary).
    CAUTION: Do not reuse O-rings.
  16. Install suitable hoses (A, B) onto the inlet side and outlet side of the CVT fluid cooler (auxiliary).
    GNSALDIA0896Z-896Courtesy of NISSAN NORTH AMERICA, INC.

    Hose inside diameter

    : 16 mm (5/8 in)

    Inlet side hose (A)

    : 102 mm (4 in)

    Outlet side hose (B)

    : 152 mm (6 in)
    NOTE: Position end of suitable hose (B) into a oil drain pan.
  17. Insert the extension adapter hose (1) from a can of Transmission Cooler Cleaner through inlet side (A) of CVT fluid cooler (auxiliary) letting cleaner drain through outlet side.
    GNSALDIA0897Z-897Courtesy of NISSAN NORTH AMERICA, INC.
    NOTE:
    • Use one full can of Transmission Cooler Cleaner.
    • Allow fluid to drain from the CVT fluid cooler (auxiliary).
  18. Remove suitable hoses from inlet side and outlet side of CVT fluid cooler (auxiliary).
  19. Insert the tip of air gun into the end of the CVT fluid cooler (auxiliary) inlet side (A).
    GNSALDIA0898Z-898Courtesy of NISSAN NORTH AMERICA, INC.
    NOTE: Wrap a shop rag around the air gun tip and end of the CVT cooler (auxiliary) inlet side, to reduce blowback.
  20. Remove any remaining fluid using compressed air at the inlet side of CVT fluid cooler (auxiliary) for 10 seconds.

    Air pressure

    : 490-883 kPa (5-9 kg/cm 2 , 70-128 psi)
  21. Install suitable hoses (A, B) onto the inlet side and outlet side of the CVT fluid cooler (auxiliary).
    GNSALDIA0896Z-896Courtesy of NISSAN NORTH AMERICA, INC.

    Hose inside diameter

    : 16 mm (5/8 in)

    Inlet side hose (A)

    : 102 mm (4 in)

    Outlet side hose (B)

    : 152 mm (6 in)
    NOTE: Position end of suitable hose (B) into a oil drain pan.
  22. While holding the hoses securely to the auxiliary fluid cooler, flush two full quarts of NISSAN CVT fluid NS-3 (or equivalent) with a 1-pint suction gun (A).
    GNSDB118481Courtesy of NISSAN NORTH AMERICA, INC.
    NOTE:
    • Flush from inlet side of the CVT fluid cooler (auxiliary) through outlet side of the CVT fluid cooler (auxiliary).
    • Allow the remaining fluid in the CVT fluid cooler (auxiliary) to drain out.
  23. Remove suitable hoses from inlet side and outlet side of CVT fluid cooler (auxiliary).
  24. Insert the tip of air gun into CVT fluid cooler (auxiliary) inlet side (A).
    GNSALDIA0898Z-898Courtesy of NISSAN NORTH AMERICA, INC.
    NOTE: Wrap a shop rag around air gun tip and end of CVT fluid cooler (auxiliary) inlet side, to reduce blowback.
  25. Remove any remaining NISSAN CVT fluid NS-3 (or equivalent) using compressed air at the inlet side of CVT fluid cooler (auxiliary) for 10 seconds.

    Air pressure

    : 490-883 kPa (5-9 kg/cm 2 , 70-128 psi)
  26. Install the CVT fluid cooler (auxiliary) and CVT fluid cooler (auxiliary) bypass valve in the reverse order of removal.
    CAUTION: Do not reuse O-rings.
  27. Install CVT fluid cooler hose A and CVT fluid cooler hose D, to CVT oil warmer. Refer to Exploded View .
    CAUTION: Do not reuse hose clamps.
  28. Fill the transaxle assembly with CVT fluid. Refer to Replacement .
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