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Home >> Chevrolet >> 2003 >> Venture Base, Van Cargo Extended >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission Servicing >> Lubrication >> Oil Cooler Flushing >> Flow Check

Flow Check

NOTE: 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, top connector, to the transaxle for normal flow.
  2. Clip the discharge hose (5) onto the empty oil drain container. See Fig 1 .
  3. Confirm the transaxle is filled with appropriate fluid. See CHECKING FLUID LEVEL & CONDITION  .
  4. Start the engine with the transaxle in Park range and run for 30 seconds. A minimum of 2 qts. (1.9L) must be discharged during this 30-second run time.
  5. If fluid flow is greater than 2 qts. (1.9L) in 30 seconds, connect the oil cooler feed pipe to the front connector on the transaxle.
  6. If fluid flow is less than 2 qts. (1.9L) in 30 seconds, perform the following diagnosis:
    1. Disconnect the discharge hose (5) from the oil cooler return pipe. See Fig 1 .
    2. Disconnect the oil cooler feed line at the radiator.
    3. Connect the discharge hose (5) to the cooler feed line.
    4. Clip the discharge hose (5) to the empty oil drain container.
    5. Start the engine with the transaxle in Park range and run for 30 seconds. A minimum of 2 qts. (1.9L) must be discharged during this 30-second run time.
  7. If the amount of transaxle fluid flow remains less than 2 qts. (1.9 L) in 30 seconds, inspect the oil cooler feed pipe, top connector, for restrictions or damage. If no condition is found with the feed pipe, inspect the transaxle.
Fig 1: Capturing Fluid Discharge
G00056985Courtesy of GENERAL MOTORS CORP.