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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 505 (Automatic Transmission - 2ML70 - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> Transmission Fluid Cooler Flushing and Flow Test (J 45096) >> Back Flush Procedure

Back Flush Procedure

WARNING: This page is about a different car, the 2012 GMC Yukon, 2012 Chevrolet Tahoe, and 2012 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Identifying J 45096-30
    GM1762577Courtesy of GENERAL MOTORS COMPANY
  1. Connect the J 45096-30  flush adapter (1) to the vehicle transmission oil cooler supply and return lines at the transmission.
    2. Fig 2: Identifying Black Supply Hose & Clear Waste Hose
    GM1762584Courtesy of GENERAL MOTORS COMPANY
  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.
    3. Fig 3: View Of Main Function Switch FLUSH Position
    GM1212339Courtesy of GENERAL MOTORS COMPANY
  3. Turn the main function switch to the FLUSH position. Allow the machine to operate for 30 seconds.
    4. Fig 4: View Of Main Function Switch IDLE Position
    GM1212341Courtesy of GENERAL MOTORS COMPANY
  4. Turn the main function switch to the IDLE position and allow the supply vessel pressure to dissipate.
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