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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 237 (Automatic Transmission - 4L80-E/4L85-E (Service & Replacement)) >> Diagnostic Information and Procedures >> Automatic Transmission Oil Cooler Flushing and Flow Test (J 45096) >> Forward Flush

Forward Flush

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  1. Disconnect the supply and waste hoses from the vehicle cooler lines. Reverse the supply and waste hoses to provide a normal flow direction.
    Fig 1: Disconnecting Supply & Waste Hoses
    G02424429Courtesy of GENERAL MOTORS CORP.
  2. Turn the main function switch to the FLUSH position and allow machine to operate for 30 seconds.
    3. Fig 2: Turning Main Function Switch To FLUSH Position
    G02424430Courtesy of GENERAL MOTORS CORP.
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