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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1788 (Automatic Transmission - 4L60-E/4L65-E (Diagnosis)) >> Diagnostic Information and Procedures >> Automatic Transmission Oil Cooler Flushing and Flow Test >> Back Flush Procedure

Back Flush Procedure

WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Connecting J 45096 Adapters To Transmission Oil Cooler Supply & Return Lines
G02131575Courtesy of GENERAL MOTORS CORP.
  1. Connect the J 45096  adapters (1) to the vehicle's transmission oil cooler supply and return lines at the transmission, may require J 35944-200  .
    Fig 2: Connecting Supply Hose To Return Line & Waste Hose To Feed Line
    G02131576Courtesy of GENERAL MOTORS CORP.
  2. Connect the black supply hose (1) to the return line, top connector of the transmission, and the clear waste hose (2) to the feed line, bottom connector of the transmission, to the vehicle cooler lines. This is the reverse flow - backflush direction.
    Fig 3: Turning Main Function Switch To FLUSH Position
    G02131577Courtesy of GENERAL MOTORS CORP.
  3. Turn the main function switch to the FLUSH position. Allow the machine to operate for 30 seconds.
    Fig 4: Turning Main Function Switch To IDLE Position
    G02131578Courtesy of GENERAL MOTORS CORP.
  4. Turn the main function switch to the IDLE position and allow the supply vessel pressure to dissipate.
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