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Home >> Chevrolet >> 2006 >> Silverado 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1736 (Automatic Transmission - 6L45/6L50/6L80/6L90 - Symptom Troubleshooting And Diagnosis) >> Transmission Fluid Cooler Flushing and Flow Test >> Forward Flush

Forward Flush

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Identifying Black Supply Hose & Clear Waste Hose
    GM1762592Courtesy of GENERAL MOTORS CORP.
  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: Setting Main Function Switch To FLUSH Position
    GM1212343Courtesy of GENERAL MOTORS CORP.
  2. Turn the main function switch to the FLUSH position and allow machine to operate for 30 seconds.
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