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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) >> Back Flush Procedure

Back Flush Procedure

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: Cooler Flushing Adapters
    GM3647525Courtesy of GENERAL MOTORS COMPANY
  1. If equipped with bypass valve, disconnect the oil cooler lines from the bypass valve.
  2. If equipped with bypass valve, connect the J-35944-200A  cooler flushing adapter (1) to the vehicle transmission oil cooler supply and return lines at the transmission.
    3. Fig 2: Cooler Flush Adapters
    GM1762577Courtesy of GENERAL MOTORS COMPANY
  3. If not equipped with the bypass valve, connect the DT-45096-30  cooler flush adapter (1) to the vehicle transmission oil cooler supply and return lines at the transmission.
    4. Fig 3: Black Supply Hose
    GM3647526Courtesy of GENERAL MOTORS COMPANY
  4. Connect the black supply hose (1) to the return line, bottom connector of the transmission, and the clear waste hose (2) to the feed line, top connector of the transmission, to the vehicle cooler lines. This is the reverse flow - backflush direction.
    5. Fig 4: View Of Main Function Switch FLUSH Position
    GM1212339Courtesy of GENERAL MOTORS COMPANY
  5. Turn the main function switch to the FLUSH position. Allow the machine to operate for 30 seconds.
    6. Fig 5: View Of Main Function Switch IDLE Position
    GM1212341Courtesy of GENERAL MOTORS COMPANY
  6. Turn the main function switch to the IDLE position and allow the supply vessel pressure to dissipate.
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