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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1626 (Automatic Transmission - 4L80-E - Service & Replacement) >> Diagnostic Information and Procedures >> Automatic Transmission Oil Cooler Flushing and Flow Test >> Flow Test

Flow Test

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Fig 1: Identifying Transmission Oil Flow Test Procedure
G01952242Courtesy of GENERAL MOTORS CORP.
IMPORTANT: The Flow Test must be performed after the flush to ensure that all flushing solution and water is removed from the oil cooling system.
  1. Disconnect the hose from the oil cooler pipe. Connect the oil cooler feed pipe, front connector, to the transmission for normal flow.
  2. Clip the discharge hose (1) to an empty oil container.
  3. Confirm the transmission is filled with automatic transmission fluid. Refer to Fluid Capacity Specifications   for the correct automatic transmission fluid capacity.
  4. Start the engine with the transmission in PARK range and run for 30 seconds after fluid begins to flow from the discharge hose (1). A minimum of 1.9 L (2 quarts) must be discharged during this 30 second run time.
  5. If the fluid flow meets or exceeds 1.9 L (2 quarts) in 30 seconds, connect the oil cooler feed pipe to the front connector on the transmission.
  6. If fluid flow is less than 1.9 L (2 qt) in 30 seconds, perform the following diagnosis:
    1. 6.1. Disconnect the J 35944-A  discharge hose (1) from the oil cooler return pipe.
    2. 6.2. Disconnect the oil cooler feed pipe at the radiator.
    3. 6.3. Connect the J 35944-A  discharge hose (1) to the oil cooler feed pipe, radiator end.
    4. 6.4. Clip the discharge hose (1) onto the oil drain container.
    5. 6.5. Start the engine with the transmission in PARK range and run for 30 seconds after fluid begins to flow from the discharge hose (1). A minimum of 1.9 L (2 qt) must be discharged during this 30 second run time.
  7. If the amount of transmission fluid flow remains less than 1.9 L (2 qt) in 30 seconds, inspect the oil cooler feed pipe, front connector, for restrictions or damage. If no condition is found with the feed pipe, front connector, inspect the transmission.
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