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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 897 (Automatic Transmission Service, Removal & Installation - 4L60-E) >> Diagnostic Information and Procedures >> Automatic Transmission Oil Cooler Flushing and Flow Test >> Back Flush Procedure

Back Flush Procedure

WARNING: This page is about a different car, the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Connecting Transmission Oil Cooling System Flush & Flow Test Tool Adapters To Vehicle's Transmission Oil Cooler Supply
G01979864Courtesy of GENERAL MOTORS CORP.
  1. Connect the J 45096  adapters (1) to the vehicle's transmission oil cooler supply and return lines at the transmission, may require J 35944-200  .
    Fig 2: Connecting Black Supply Hose To Return Line & Clear Waste Hose To Feed Line
    G01979865Courtesy of GENERAL MOTORS CORP.
  2. Connect the black supply hose (1) to the return line, top connector of the transmission, and the clear waste hose (2) to the feed line, bottom connector of the transmission, to the vehicle cooler lines. This is the reverse flow - backflush direction.
    Fig 3: Turning Main Function Switch To FLUSH Position
    G01979866Courtesy of GENERAL MOTORS CORP.
  3. Turn the main function switch to the FLUSH position. Allow the machine to operate for 30 seconds.
    Fig 4: Turning Main Function Switch To IDLE Position
    G01979867Courtesy of GENERAL MOTORS CORP.
  4. Turn the main function switch to the IDLE position and allow the supply vessel pressure to dissipate.
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