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Home >> GMC >> 2003 >> Jimmy 2D Utility, Part Time, Automatic >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission Servicing >> Lubrication >> Oil Cooler Flushing & Flow Check >> Flow Check

Flow Check

NOTE: The Flow Check must be performed after the flush to ensure that all flushing solution and water is removed from the oil cooling system.
  1. Disconnect both hoses from the oil cooler pipes. Connect the oil cooler feed pipe, bottom connector, to the transmission for normal flow.
  2. Clip the discharge hose (5) onto the empty oil drain container. See Fig 1.
  3. Confirm the transmission is filled with ATF. See CHECKING FLUID LEVELS .
  4. Start the engine with the transmission 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 the fluid flow meets or exceeds 2 qts. (1.9L) in 30 seconds, connect the oil cooler feed pipe to the bottom connector on the transmission.
  6. If fluid flow is less than 2 qts. (1.9L) in 30 seconds, perform the following diagnosis:
    • Disconnect the discharge hose (5) from the oil cooler return pipe.
    • Disconnect the oil cooler feed line at the radiator.
    • Connect the discharge hose (5) to the cooler feed line.
    • Clip the discharge hose (5) to the empty oil drain container.
    • Start the engine with the transmission 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 transmission fluid flow remains less than 2 qts. (1.9L) in 30 seconds, inspect the oil cooler feed pipe, bottom connector, for restrictions or damage. If no condition is found with the feed pipe, bottom connector, inspect the transmission.
Fig 1: Capturing Fluid Discharge
G00056985Courtesy of GENERAL MOTORS CORP.