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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1361 (Automatic Transmission - 4L80-E - Service & Replacement) >> Diagnostic Information and Procedures >> Automatic Transmission Oil Cooler Flushing and Flow Test >> Forward Flush

Forward Flush

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying J 35944-A Water Supply Valve Position
G01952240Courtesy of GENERAL MOTORS CORP.
  1. Disconnect both hoses (1 and 2) from the oil cooler pipes and connect them to the opposite oil cooler pipe. This will allow the oil cooler and pipes to be flushed in the normal flow direction.
  2. Repeat Step 6 and 7 of the Back Flush.
    Fig 2: Identifying J 35944-A Water Supply Valve Position
    G01952241Courtesy of GENERAL MOTORS CORP.
  3. Release the trigger (1) of the J 35944-A  and allow water only to rinse the oil cooler and pipes for 1 minute.
  4. Turn the J 35944-A  water supply valve (3) to the OFF position and turn OFF the water supply at the faucet.
  5. Attach the shop air supply to the flushing system feed air valve (2) on the J 35944-A  and blow out the water from the oil cooler and pipes. Continue, until no water comes out of the discharge hose.
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