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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 813 (Automatic Transmission - 4L80-E/4L85-E (Service & Replacement)) >> Diagnostic Information and Procedures >> Automatic Transmission Oil Cooler Flushing and Flow Test (J 45096) >> Back Flush Procedure

Back Flush Procedure

WARNING: This page is about a different car, the 2003 GMC Yukon XL, 2003 Chevrolet Suburban, and 2003 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Connecting J 45096 Adapters To Vehicle's Transmission Oil Cooler Supply
G02112098Courtesy 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. It may require the use of J 35944-200  cooler flushing adapter.
    Fig 2: Connecting Black Supply Hose To Return Line
    G02112099Courtesy of GENERAL MOTORS CORP.
  2. Connect the black supply hose (1) to the return line, rear connector of the transmission, and the clear waste hose (2) to the feed line, front connector of the transmission, to the vehicle cooler lines. This is the reverse flow - backflush direction.
    Fig 3: Turning Main Function Switch To FLUSH
    G02112100Courtesy 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
    G02112101Courtesy 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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