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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 362 (Automatic Transmission - 6L80/6L90 - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> Transmission Fluid Cooler Flushing and Flow Test >> Back Flush Procedure

Back Flush Procedure

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    Fig 1: Cooler Flush Adapter
    GM1762577Courtesy of GENERAL MOTORS CORP.
  1. Connect the DT 45096-30  cooler flush adapter (1) to the vehicle transmission oil cooler supply and return lines at the transmission.
    2. Fig 2: Black Supply Hose And Clear Waste Hose
    GM1762584Courtesy of GENERAL MOTORS CORP.
  2. Connect the black supply hose (1) to the return line, bottom connector of the transmission, and the clear waste hose (2) to the feed line, top connector of the transmission, to the vehicle cooler lines. This is the reverse flow - backflush direction.
    3. Fig 3: Main Function Switch FLUSH Position
    GM1212339Courtesy of GENERAL MOTORS CORP.
  3. Turn the main function switch to the FLUSH position. Allow the machine to operate for 30 seconds.
    4. Fig 4: Main Function Switch IDLE Position
    GM1212341Courtesy 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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