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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 506 (Automatic Transmission - 6L80/6L90 - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> Transmission Fluid Cooler Flushing and Flow Test >> Forward Flush

Forward Flush

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    Fig 1: Identifying Black Supply Hose & Clear Waste Hose
    GM1762592Courtesy of GENERAL MOTORS COMPANY
  1. Disconnect the supply and waste hoses from the vehicle cooler lines. Reverse the supply and waste hoses to provide a normal flow direction.
    2. Fig 2: View Of Main Function Switch FLUSH Position
    GM1212343Courtesy of GENERAL MOTORS COMPANY
  2. Turn the main function switch to the FLUSH position and allow machine to operate for 30 seconds.
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