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.

Disconnect the hose from the oil cooler pipe. Connect the oil cooler feed pipe, bottom connector, to the transmission for normal flow.
Clip the discharge hose (5) onto the empty oil drain container. See Fig 1 .
Confirm the transmission is filled with automatic transmission fluid. See CHECKING FLUID LEVELS .
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.
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.
If fluid flow is less than 2 qts. (1.9L) in 30 seconds, perform the following diagnosis:
1. Disconnect the flusher discharge hose (5) from the oil cooler return pipe.
2. Disconnect the oil cooler feed pipe at the radiator.
3. Connect the flusher discharge hose (5) to the oil cooler feed pipe, radiator end.
4. Clip the discharge hose (5) onto the oil drain container.
5. Start the engine with the transmission in Park range and run for 30 seconds after fluid begins to flow from the discharge hose (5). A minimum of 2 qts. (1.9L) must be discharged during this 30 second run time.
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

Courtesy of GENERAL MOTORS CORP.