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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 194 (Automatic Transmission Cooling System) >> Diagnostic Information and Procedures >> Transmission Fluid Cooler Flow Test and Flushing (8L90) >> Forward Flush

Forward Flush

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Supply And Waste Hoses
    GM3647527Courtesy of GENERAL MOTORS COMPANY
  1. Disconnect the supply and waste hoses from the vehicle cooler lines. Reverse the supply hose (2) and waste hose (1) 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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